Don’t Use An “S-Trap” For Your Sink

If you’re thinking about investing in an s-trap pipe for your plumbing system, think again! This blog will make sure that the time and money spent on replacing piping under a sink is done properly. Your basic residential plumbing system is designed to:

1. supply hot and/or cold water when called upon at a plumbing fixture
2. remove wastewater from the fixtures
3. prevent foul odors from entering your home.

What is an S Trap?

This type of trap does not support these goals effectively and can actually be detrimental to your plumbing system. The “S” trap is prohibited under the Uniform Plumbing Code throughout the United States. This is because s traps do not maintain a water seal between the fixture and the trap and as such, s traps can siphon or suck water out from the trap. This will end up releasing foul odors, including methane (sewer) gases into the home. So, s traps are a code violation and if you are doing remodeling work in your home, you may have to replace s traps with an approved plumbing fixture.

For residential plumbing systems, a P trap is a preferred solution as these pipes maintain a water seal between the fixture and the trap, which prevents odors from entering your home. Is an s trap illegal? This trap should really be avoided for all residential properties in order to ensure the proper functioning of the plumbing system and avoid any code violations.

S vs P Trap

S trap drain are not a good choice for residential plumbing systems and it is recommended that they be removed and replaced by an approved plumbing fixture, such as a p trap pipe. This will ensure that your plumbing system functions properly and safely.

We usually find these traps installed on homes that have been remodeled or had a repair and the p trap was not properly installed.

S Trap to P Trap Conversion Kit – How to Install

If you want to replace an s-trap drain with a p trap, there are some steps you need to take. First, you will need to purchase a conversion kit for your specific sink or faucet. This typically includes a new supply line and gasket as well as the new p trap pipe and fittings. You can find these kits at most home improvement stores.

S-Trap to P Trap Conversion Kit

This one above has an air admittance valve assembly. An air admittance valve (AAV), also known as an auto vent, is a device that allows air to enter the plumbing system without relying on a vent extending to open air. This makes it possible for a fixture drain, such as a sink or toilet, to be installed in places where there is no access to outside air.

Once you have your s-trap to p-trap conversion kit, you will need to turn off the water supply and drain any remaining water in the pipes. With that done, you can begin installing the new p trap pipe by following the instructions provided with your kit. You will want to make sure everything is securely tightened and no leaks are present before you turn the water back on.

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Don’t Use An “S-Trap” For Your Sink

As always, if you have any questions please don’t hesitate to reach out to us. We would be happy to help clarify anything that may still be unclear.

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