Introduction
Replacing a PVC sink trap is a common DIY plumbing task that many homeowners eventually need to undertake. PVC traps get clogged, leak, or simply wear out over time. Fortunately, installing a new PVC sink trap is a relatively straightforward job that can be completed in less than an hour by following some simple steps.
In this comprehensive guide, we’ll walk through everything you need to know to successfully replace a PVC sink trap under a bathroom or kitchen sink. We’ll cover how to identify when you need a new trap, what supplies are required, steps for removing the old trap and installing the new one, and tips for troubleshooting any issues along the way. With a little time and effort, you can replace a faulty PVC sink trap and restore proper draining to your bathroom or kitchen sink.
When to Replace a PVC Sink Trap
There are a few signs that indicate it’s time to replace an old PVC sink trap:
- Slow or backed up draining: If water is draining slower than usual or not fully emptying from the sink, there is likely a clog in the trap. Attempting to clear debris from a trap doesn’t always work, so replacement is often the best solution.
- Leaking joints: If water is leaking from joints in the trap, the plastic pieces may be cracked or disconnected. Replacing the entire trap is easier than attempting to reseal leaking joints.
- Corrosion: PVC can become corroded, cracked, or warped over time, especially if regularly exposed to drain cleaners. A corroded trap should be replaced.
- Missing or broken pieces: Sometimes parts of the trap assembly can break, go missing, or fail to fit together properly. Replacement is necessary if the trap is incomplete or components don’t align.
- Odor: A strong rotten egg smell coming from the drain often indicates sewer gas is escaping through cracks in an old trap. A new trap can seal off odors.
If you notice any of these issues, purchasing a new PVC sink trap kit is the best solution.
How to Replace a PVC Sink Trap: Supplies Needed
Replacing a sink trap only requires a few inexpensive supplies:
- PVC trap kit: Kits come with PVC pieces to assemble a new trap. Make sure to select the right size, shape, and connections for your existing sink drain.
- Teflon tape: Used to wrap pipe threads to create a tighter seal.
- Adjustable wrench: For loosening and tightening slip joints and compression nuts. Avoid using pliers as they can crack PVC parts.
- Bucket: To catch water as you remove trap pieces.
- Rag or paper towels: For cleaning up drips or small spills during the process.
- Gaskets/washers: Your trap kit may come with these to provide watertight seals. If not, pick some up.
Purchase a trap kit designed specifically for sinks. Kits for tub drains have additional components you likely won’t need for a sink install. It’s also a good idea to take the old trap apart before shopping so you can match pieces.
How to Remove the Existing PVC Sink Trap
Once you’ve gathered the necessary replacement supplies, you’re ready to remove the old PVC trap. Follow these steps:
1. Turn off water supply valves
Locate the shut off valves for both hot and cold water lines under the sink and turn them off. This prevents water from spilling out of supply lines when you disconnect the trap.
2. Place a bucket underneath
Position a bucket underneath the area where the trap meets the drain tailpiece. Water will spill out when you detach the pieces.
3. Loosen slip joints
Check the connections between the trap and sink tailpiece and the trap and drain arm. There are likely slip joints held in place by compression nuts. Use an adjustable wrench to loosen the nuts by turning counterclockwise.
4. Unscrew threaded connections
Some connections may be threaded rather than slip joints. Use an adjustable wrench to unscrew these by turning counterclockwise.
5. Disconnect trap sections
After loosening all joints, gently pull apart the trap sections by hand and place them in the bucket. Avoid bending or stressing the pipe when pulling it apart.
6. Remove old Teflon tape
Examine the threaded connections and remove any old, worn out Teflon tape. New tape will be applied when installing the new trap.
7. Clean the area
Wipe away any grime or debris around the sink drain opening. A clean surface will allow for a tight seal with the new trap.
With the old trap fully detached and removed, you can now focus on installing the new replacement trap.
How to Install a New PVC Sink Trap
Follow these key steps to properly install a new PVC sink trap:
1. Dry fit the trap
Assemble the new trap pieces without using any adhesives or sealants. Lightly hand tighten joints but do not fully tighten them yet. Dry fitting will allow you to ensure the trap aligns and fits correctly. If necessary, use a hacksaw to cut any pieces to proper length.
2. Wrap threaded connections with Teflon tape
Wrap Teflon tape clockwise around any threaded connectors. 2-3 overlapping layers provides a good seal. Ensure threads are fully covered.
3. Apply gaskets/washers
Your new trap kit may come with rubber gaskets or washers. Slide these over pipe ends before making connections. This creates a watertight seal.
4. Connect trap to sink tailpiece
Attach one end of the trap to the tailpiece extending from the sink drain. Hand tighten any slip joints initially.
5. Connect trap to drain arm
Attach the other end of the trap to the drain arm in the wall. The trap should slope slightly downward towards the drain.
6. Tighten all joints
Once aligned, finish tightening all slip joints and threaded connections with your adjustable wrench. Tighten firmly but avoid over-tightening.
7. Test for leaks
Turn water supply back on and visually inspect all connections. Look for water droplets that indicate leaks. Tighten areas that leak.
Once installed without any leaks, the new PVC sink trap is ready for use! Turn the water supply back on fully. The sink can be used normally and water should drain properly.
Tips for Troubleshooting PVC Sink Trap Installation
Sometimes issues arise when installing a new sink trap. Here are some troubleshooting tips:
- Leaking joints – Disassemble, apply more Teflon tape, and reattach. Use washers if the kit included them. Tighten firmly with wrench.
- Drain clogs – A fresh clog can occur Coincidentally when installing new trap. Try snaking the drain prior to trap install.
- Trap alignment problems – Dry fit again and use hacksaw to cut and adjust any pieces until the trap sections fit together properly.
- No slope – The trap must slope slightly downward to allow water to flow. Position the trap so it slopes in the right direction.
- PVC cracks – If overtightening causes any sections to crack, they must be replaced. Avoid using pliers and over-tightening joints.
- Odors – If smells persist, there may be a leak allowing sewer gas to escape. Check for tiny leaks and reseal problem area with Teflon tape.
Replacing a PVC sink trap is usually a straightforward DIY project. Following the steps above and keeping these troubleshooting tips in mind will allow you to successfully install a new trap and restore normal draining. For stubborn sink drainage problems or complex trap replacements, a professional plumber can provide assistance. But in most standard bathroom and kitchen sink scenarios, you can handle this common plumbing repair yourself and save the cost of a house call.
Frequently Asked Questions About Replacing PVC Sink Traps
What are PVC sink traps made of?
PVC, or polyvinyl chloride, is a durable plastic used extensively in plumbing systems. PVC is sturdy but still lightweight and inexpensive. All components of PVC sink traps, including pipes, elbows, nuts, and washers, are made from this molded plastic material.
How do I choose the right PVC sink trap?
Select a trap kit designed specifically for sink drains, rather than tubs or showers. Measure the dimensions of your existing trap and match those as closely as possible. Note the diameter of the pipes and the connectors used (slip joints vs. threaded). Matching your old trap style helps ensure proper fit.
Where exactly is a PVC sink trap located?
A PVC sink trap is positioned right below the sink drain itself. It connects to the tailpiece extending down from the sink strainer. The trap forms an “S” or “U” shape that holds water to block sewer gases. Traps are normally installed directly underneath and behind a bathroom or kitchen sink.
How do I clean a smelly PVC sink trap?
To clean a stinky trap, disconnect it from the tailpiece and drain arm. Then submerge the trap fully in a bucket filled with very hot water and baking soda or vinegar to dissolve grime. Scrub with an old toothbrush if needed. Rinse thoroughly before reinstalling. Avoid harsh chemical cleaners as they can degrade plastic.
Why does my PVC sink trap keep leaking?
If a newly installed PVC trap leaks, joints may be improperly aligned or not fully tightened. Disconnect, realign, wrap threads with additional Teflon tape, and tighten all connections very firmly without cracking plastic. Cracked slip nuts, washers, or gaskets can also cause leaks, requiring replacement parts.
Can I glue a PVC sink trap together?
PVC components are typically assembled by hand without adhesives. But for a permanent install, applying a PVC-safe cement glue to the joints is an option. Avoid super glue or other chemical adhesives. Always follow the trap manufacturer’s recommendations.
How do I cut PVC trap pieces to proper length?
Use a hacksaw with a blade designed for cutting plastic. Mark cut lines carefully and brace the pipe to avoid splintering as you cut. Sand cut ends smooth before assembly. Measure twice and cut only once for proper fit. Go slowly to avoid cracking PVC parts.
What can I do if my PVC trap won’t align correctly?
Start by dry fitting the pieces without applying any sealant. If sections don’t align, use a hacksaw to trim ends to the proper shape and length as needed. Check that all old Teflon tape is removed from threads. Adjust positions, angle pieces as needed, and test fit multiple times until the trap fits together correctly before final assembly.
How long does a PVC sink trap last before needing replacement?
PVC traps can last 5-10 years or longer with proper maintenance. Harsh household chemicals, hard water buildup, and over-tightening connections during installations can reduce lifespan. Inspect traps occasionally and replace immediately if cracks develop or significant slow draining occurs.
Conclusion
Installing a new PVC sink trap is an essential DIY skill most homeowners will need to tackle at some point. Following the steps and tips outlined above will allow you to remove an old worn out or leaking sink trap and install a replacement properly without having to call a plumber.
The process involves shutting off water valves, disconnecting the old trap, cleaning the area, dry fitting a new trap, applying Teflon tape and gaskets, making watertight connections, sloping the trap correctly, and testing for leaks before turning the water back on. Taking your time is key, along with proper alignment and hand tightening.
While minor issues can occur, any leaks, clogs, or alignment problems can normally be troubleshot and resolved, allowing your new PVC trap to serve for years of reliable kitchen and bathroom sink drainage. With the right knowledge and preparation, you can avoid trap troubles and maintain fast sink draining on your own.