How to install a bathroom sink drain (2023)




Introduction: How to install a sink drain

About: DIY Montreal is all about woodworking and DIY projects. I post how-to videos on my YouTube channel as well as step-by-step tutorials on my website Constructions mainly include carpentry projects...More about diymontreal »

In my last tutorial I showed you how to create afloating vanityfor my dresser In this DIY plumbing tutorial I show you how to install your sink drain i.e. H.P-trap.

If you would also like to see how I installed my wall mounted faucet and sink,watch the videoabove.

There are 3 parts you will need when installing a new sink drain:P-Fallen-Kit, ATrap-Adapterand a popup (or normal) windowWashbasin waste set.


Step 1: Install the pop up drain

IsPop-up flow assemblyIt usually comes with your sink or can be purchased separately as a kit.

(Video) How To Install Bathroom Sink Drain/Faucet, No Leaks Under Gasket, Threads [SOLVED] 2023

To ensure a tight seal, I apply a dropSiliconearound the drainpipe. Be sure to use 100% silicone and apply a generous drop before dropping the dropdrain into a sink hole.

I added under the sinkRubber Ring, first add a little silicone to the threads to make it curl smoothly.

Next, as shown in the assembly diagram, I added thisplastic ring and a nutwhich I hand-tighten first and then give it another quarter turn with a littlePliers for sliding jointsto squeeze it.

Once everything underneath is fully tightened, you should be safeWipe off any silicone squeezesdrain and rinse with a clean, damp cloth.

I am now able to connect the final part of the pop up drain assembly which includes: aRubber Ringthat will create a stamp with itsmooth metal tube. So far I've only hand tightened the nut, but I'll be back later with pliers to tighten everything up.

Step 2: Install the P-Trap Adapter

A new sink installation will usually have a piece of pipe sticking out of the wall. To connect the P-trap you need aTrap-Adapterwhich needs to be glued to the pipe on the wall.

Since my pipes are ABS, I useABS cement. I simply clean the inside of the trap adapter with some cement and do the same on the outside of the drain, making sure both surfaces are completely covered, then push the adapter all the way in and do a slight twisting motion, about a quarter of the way. Round.

Step 3: Install the P-trap

While the cement dries, let's take a look at theP-Fallen-Kit. Usually all of these parts are included in the kit: the drain, two plastic or rubber washers and two sliding nuts.

start withConnect the 2 black hoses. Simply slide a nut onto the drain and push it against the other pipe, then finger tighten the nut. No washers are needed here.

Then find themWashing machine that fits in the drain under the sink. You will find that one of them is too loose but the other fits perfectly. place aslip nutfirst on the pipe, then on the washer.

Advice:It's important to note the orientation of the washer when using slip joints - make sure the tapered sides are facing what you want to join.

Next, connect the drain to the wall. Your pipe may be too long and can be cut with a hacksaw.

Once you have cut the drain slide it over aslip nutthen look at youanother nutfacing the wall and last the restwashing machine, tapered side to the wall. Insert the tube into the wall and screw it into the adapter.

(Video) P-Trap Installation: Drain Doesn't LINE UP with Bathroom Sink Pipe - 2022

Finally add theU-shaped tubeand connect the slip joint nuts at each end, gradually tightening and re-tightening the parts as needed to ensure everything lines up without stressing any of the joints.If your parts don't fit together and you find yourself forcing a connection, you'll likely end up with a leak.

Once everything is aligned, hand tighten all nuts. After that I used slip joint pliers to tighten them a bit to get them snug and tight, being careful not to over tighten.

Step 4 - Leak Test

The final step is to test the drain for leaks. First, I turn on the faucet and check the pipes for leaks.

Everything is looking good so far, so I'm going to put it to the ultimate test by filling the sink completely and then emptying it. I repeated this process a few times.

No leakage! What a relief. If you had a leak, try squeezing the leaking joint a little before testing again.

If not already donewatch this videofor more details.


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    Should I use plumbers putty on sink drain? ›

    If you need to stop or prevent leaks around your faucet, sink or tub drains − plumber's putty is the product you need. Plumber's putty is a sealing staple for professionals, homeowners and DIY-ers alike.

    How do you seal a bathroom sink drain? ›

    Use a plumber's putty to seal the top side of the sink drain. Plumber's putty does not bind to surfaces. However, it plugs the contact between the metal drain flange and the porcelain. For plumbers' putty to be effective, all surfaces must be clean and dry.

    Should I use plumbers putty or silicone? ›

    The main difference between plumbers putty or silicone for sink drain is how easy the substances are to manipulate or remove. Plumbers putty is very easy to manipulate into tight areas, and it's also easier to remove. That makes silicone putty better for waterproofing, even if it's more difficult to work with.

    Should you silicone around sink drain? ›

    Sealing around kitchen sinks or sealing a sink drain with silicone will keep your sink in good condition and prevent future problems. Using a high quality, waterproof sealant prevents water and debris from entering the gaps.

    What is the best way to seal a sink drain? ›

    When it comes to fixing leaks, silicone caulk is one of the best options because it's inexpensive, easy to use, and can be found in most hardware stores.

    How long do you have to wait to use sink after plumbers putty? ›

    It takes a few hours for plumber's putty to set. You can use a drain or tap immediately after installing the putty, although waiting a few hours may yield the best results. The putty will expand so might create a tighter seal.

    What is the best sealant for bathroom sink? ›

    Silicone and silicone blend caulks are most commonly used for kitchen and bath projects. They can be use around sinks, tubs and showers.

    What sealant do you use for bathroom sink? ›

    Silicone caulk is the go-to option for sealing around plumbing fixtures, such as sinks, toilets, and faucets, and for any caulk joints on the tile in wet areas.

    How do you seal PVC pipe under sink? ›

    Different Ways to Fix a Leaky PVC Pipe
    1. Fiberglass resin tape: Fiberglass resin tape works well for temporary repairs intended to slow damage. ...
    2. Epoxy putty: Epoxy putty essentially plugs the hole, crack or leak in the pipe to create a new surface. ...
    3. Silicone repair tape: Silicone repair tape works well for small repairs.
    Jun 13, 2022

    Does PVC drain pipe need to be glued? ›

    PVC and CPVC cement actually break down the external layers of the pipe, allowing the material to literally combine. This permanently bonds PVC pipe and fittings. If you are trying to use PVC pipe to transport fluid or gas, PVC cement or special push-on fittings are necessary to assure there are no leaks.

    How deep should PVC drain pipe be? ›

    Dig a trench from the place in your yard that needs drainage to your chosen outlet. Check for underground utility lines and pipes before digging. The trench should be about 18 inches deep and 9 to 12 inches wide.

    Can I use PVC pipe for sink drain? ›

    The most common type of pipe used for sink drains is PVC. PVC pipes are available in a variety of sizes, but the most common size is 1-1/2 inches.

    Where should you not use plumbers putty? ›

    Do not use plumber's putty where you need adhesive strength (to bond materials or prevent them from moving) or where you need a watertight seal in exposed areas. Follow these other tips for the best results: Plumber's putty should be pliable and easy to roll.

    Can you use caulk to seal a sink drain? ›

    Next, remove any old sealant at the bottom of your drain flange with a putty knife. Make sure the depressed area around the sink drain is also clear of any built-up material. Afterwards, apply a bead of silicone caulk around the drain hole in the sink. Then, apply a second bead along the underside of the drain flange.

    Is plumbers tape better than plumbers putty? ›

    Thread seal tape and pipe dope are both effective pipe sealants. However, many people prefer using thread seal tape since it is cleaner to work with than traditional grease or paste-like sealants. Plumber's putty is used to form a water tight seal between the sink and the faucet and between the sink and the drain.

    How much does it cost to install a new sink drain? ›

    When it comes to replacing or repairing the drain pipes in your house, the cost can range significantly depending on the type of drain pipe, the location in your home and the labor and material costs specific to your region. You can estimate an average cost between $250 and $1,250 with the national average around $700.

    How much does it cost to replace bathroom sink drain pop up assembly? ›

    How Much Does It Cost to Install a Bathroom Sink Drain? HomeGuide says the average cost to replace a drain is between $500 to $800 for a reasonably simple pipe replacement job. There are several things that can increase the cost of this, however.

    Is silicone enough to hold a drop in sink? ›

    The best sealant for a drop-in sink

    A bead of caulk is run along the rim of the sink after installation to create a watertight seal and hold the sink in place. Silicone sealant is best used for this application because of its flexibility and resilience.

    Can you use a rubber gasket instead plumbers putty on sink drain? ›

    The rubber gasket should be sufficient to seal without putty.

    What kind of silicone do I use for sink drain? ›

    RELN Drainage Sealant is 100% silicone and designed to be used with Channel Drains, Catch Basins and Sewer and Drainpipe to prevent leaks by creating watertight connections at each drainage assembly point.

    Where does the rubber seal go on a sink drain? ›

    The Flange of the basket strainer goes on the inside of the sink and the rubber washer/gasket, paper gasket, pressure cup and nut are under the sink. The rubber washer seals the sink from below, putty or caulk seal the flange to the sink from above.

    Is plumbers putty a permanent fix? ›

    Both plumbers putty and epoxy pipe lining use epoxy for sealing water leaks. However, plumbers putty goes on the outside of plumbing pipes in order to temporarily stop a leak, while epoxy pipe lining is used to permanently stop leaks and restore the integrity of the plumbing pipe.

    How effective is plumbers putty? ›

    It won't harden, shrink, dry out or crumble. This makes it perfect to seal plumbing fixtures, although it's not good on pipe threads. One advantage putty has over sealants like silicone is it lets you more easily take the plumbing components apart afterward. The putty stays pliable.

    Can I use Teflon tape instead of plumbers putty? ›

    They serve totally different purposes. Plumber putty to fill small gaps under faucet. Teflon tape or liquid is for sealing threaded connections that do not have o - ring or washer. You never use "teflon" tape where putty goes, and you never use putty where teflon tape goes.

    Can You Use Flex seal on bathroom sink? ›

    Flex Glue can be used for an assortment of bathroom repairs. Customers often use the waterproof glue to fix toilet tanks, shower tiles, sink pipes, and other bathroom needs. Flex Glue is also mold and mildew resistant, making it perfect for bathroom repairs.

    Can I use plumbers putty on bathroom sink? ›

    Plumber's putty is most often used to fix minor leaks in the bathroom and kitchen drains, as well other plumbing pipes.

    What is the easiest bathroom sink to install? ›

    Drop-In / Top Mount / Self-Rimming

    The most common bathroom sink type, drop-ins are the easiest type of sink to install (especially in stone countertops, where the cutout edges need not be polished as with undermounts).

    Do you need to caulk around bathroom sink? ›

    Bathroom sinks: If it's an undermount sink, yes, it must be caulked. This prevents any water from penetrating into the countertop material and cabinetry below. Otherwise, you could get mould. (Always make sure to use waterproof, mildew-resistant silicon caulking in kitchens and bathrooms.)

    Should I caulk between sink and wall? ›

    Newly installed sinks will require sealing; as will old sinks that may have become loose from the wall. Sealing prevents water and dirt running down the wall behind your sink.

    Why is the pipe under my sink leaking at the connection? ›

    Loose Compression Nut:

    Likely the most common reason why your drain pipe is leaking at the connection. A loose compression nut will not seal the pipe correctly, so be sure to check the condition of the compression nut prior to scheduling a plumber to come out.

    What is the best way to seal PVC pipe? ›

    Joint Compound and Thread Tape

    Most DIY-ers use thread seal tape, which is usually made from PTFE (Teflon), due to how easy and clean it is. All you need to do is wrap it around the male threads. A stronger yet messier option is joint compound, also called pipe dope.

    Why is my bathroom sink leaking from underneath? ›

    Leaks in a bathroom sink are frequently caused by clogged water supply lines, faulty p-traps, or poor sink drain pipe connections. Other reasons for bathroom sink leaks include blocked water supply pipes, incorrect p-traps, and poor sink drain connections; so double-check these areas.

    What happens if you don't use PVC primer and glue? ›

    PVC primer maximizes the strength and longevity of the joint connection. A joint will still weld together without the primer, but the connection will not be as strong as the primer allows the cement itself to penetrate deeper into the material.

    What is the best PVC glue for sink drain? ›

    The best bonding agent for PVC pipes and fittings is PVC solvent cement, and there are no substitutes that are good enough to replace it, especially for high-pressure applications.

    How long do you have to wait to run water after glueing PVC drain? ›

    PVC Glue Dry Time

    Some products suggest waiting up to two hours before continuing or turning your plumbing back on. While these are good benchmarks to wait for PVC glue to dry, it's always best to read the instructions on your particular product and check your work to ensure you got a tight seal.

    Do you need gravel under drain pipe? ›

    All drainage pipes should be placed on the gravel bed in the trench. PVC drainpipe, if used, should be placed in the trench with the holes facing down.

    What size PVC is used for sink drains? ›

    The 1½-inch size is used to capture water that might flow out of a kitchen sink, a bathroom vanity or a tub. The two-inch pipe is commonly used to drain a shower stall or washing machine, and it may be used as a vertical stack for a kitchen sink. A three-inch pipe is what's used in homes to pipe toilets.

    What is the fall for drainage pipe? ›

    What is the recommended fall for a soil pipe? The minimum fall for a waste pipe is 1 in 40. The maximum fall is 1 in 110 (apart from vertical pipes but that's a different story). So pipes with a gradient between 1 in 40 and 1 in 110 should have adequate flow to prevent blockages from occurring.

    Which pipe is best for sink drain? ›

    1. PVC Pipes. PVC is a plumbing pipe known for its versatility, lightweight, and blockage resistance. PVC piping is generally used as part of a sink, toilet, or shower drain line, though it's sometimes used as a home's main water supply pipe.

    What material is best for sink drains? ›

    Kitchen Sink Waste Pipe- PVC

    The PVC material is the best for kitchen sink waste pipes as the material is tested to withstand extreme temperatures of water, thick enough to avoid any slitting and ripping in case of sharp-edged waste and has smooth interiors to allow fast and smooth drainage.

    What is the standard hole size for a bathroom sink drain? ›

    There are three common drain sizes for bathroom sinks, 1.25", 1.5" and 1 5/8 (1.625"). You need to select a drain that is the same size or SMALLER than the hole in your sink. For example, if you have a sink with a drain hole of 1.75", than any of the drains 1.25", 1.5", or 1.65" will work.

    How do I connect the drain to the bottom of my sink? ›

    Start by adding plumber's putty to the underside of the basket strainer and fit it into the drain hole at the bottom of the sink. Then, tighten the nut with a basket wrench to secure it in place. You can then fit a brass tailpiece onto the bottom of the basket strainer, reconnect the drainpipes, and you're done!

    What parts do I need for a bathroom sink drain? ›

    There are 3 parts you'll need when installing a new sink drain: a P Trap kit, a trap adapter, and a pop-up (or regular) sink drain assembly.

    Why does my pop-up drain leak? ›

    Pop-up drains sometimes spring a leak at the point where the pivot rod enters the drain pipe. Leaking can start if there is loosening or cracking of the compression nut that holds the pivot rod in the drain pipe. If a leak is traced to this nut, it can usually be stopped by tightening the nut.

    Can I install an overflow drain in a sink without overflow? ›

    If your sink features an overflow, it is very important to purchase a drain with an overflow opening so that your sink and drain function properly. If your sink does not feature an overflow hole it needs to be paired with a a drain without overflow.

    What is a push pop drain? ›

    A Push Pop-Up drain and a pop-up drain with lift rod provide the same function — closing and releasing the drain — but they operate differently. To operate a Push Pop-Up drain, push down on the stopper to seal it, and push again to release it.

    How does a pop-up clicker drain work? ›

    SO HOW DOES A SINK POP-UP MECHANISM WORK? It's actually a fairly simple design. When the lift rod is pulled upwards, it pulls the pivot rod up as well. This pivot rod is attached to the stopper, which is pulled down, effectively sealing the sink.

    What if new sink drain doesn t line up with existing pipes? ›

    If the tailpiece will not line up with the trap, move the trap into its original position, tighten the collar with the pipe wrench and obtain a flexible tailpiece extension for your drain. The size is typically 1 1/4-inch in the outer diameter of the plastic pipe.

    How far below the bottom of a sink should the drain pipe be? ›

    The correct rough-in height for sink drains to pass the inspection is between 18 and 20 inches. Standard sink drains usually start from 24 inches and stop at 28 inches, so the rough-in height should be slightly lower than this height range.

    What is the drain pipe under the sink called? ›

    Trap: A P-trap is a two-part pipe under your sink that allows waste and water to pass through. The bend in the pipe prevents sewer gasses from entering.

    Does a bathroom sink drain need a trap? ›

    Even if you are meticulous about never dropping things down the drain, you still need a p-trap under your sink to keep gas out. Sewer gases can rise through the drain pipes in your home, but the u-shaped bend in the p-trap collects water. This water blocks the gases from rising up into your sink.

    Does a bathroom drain need a trap? ›

    Plumbing codes require a P-trap be installed anywhere there is an open drain line that expels wastewater into a drain waste-vent system. The P-trap traps solids that can clog the drain or sewer line.

    Are all bathroom sink drains the same? ›

    There are three common drain sizes for bathroom sinks, 1.25", 1.5" and 1 5/8 (1.625"). You need to select a drain that is the same size or SMALLER than the hole in your sink.


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