The setout of S-trap is the distance from the wall to the centre of the waste pipe in the floor. A P flows better, a bottle uses less space. A common style is the P-trap, which is highly effective and common. Said it’s actually a p-trap, because the vent is within 5 feet of the weir. Understand the S trap is found in most toilets. 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The design of a P-trap will keep the required amount of water is sitting in the trap which act as a barrier to the sewer gases. P Trap containing water and indicating incoming and outgoing water. Re: 1-1/4" vs. 1-1/2" p-trap; Author: Backyard plumber (OK) The arm can be as long as you want it to be. The bottle trap essentially uses a P-trap-style bend … ✦ S-Trap:The s-trap, as the name suggests, has two oppositely curved sections, which together form an ‘S’. In a P-trap configuration, the drain also comes down from the sink and into the trap, but instead of looping over and back down, the drain enters a horizontal run before exiting downward. The only difference between a P-trap and an S-trap is the horizontal length of pipe on the outflow side which allows you to connect the vent. This image shows s-trap vs p-trap. When the sink is empty, water flows back into the trap from the pipe and air is sucked back in through the vent, equalizing the pressure to keep the trap full of water. An s-trap is so-called because of its general shape, which looks like an “S”. InterNACHI® is a registered trade­mark of the Inter­national Association of Certified Home Inspectors perfectly legal and much easier to snake as the 2'' trap is easier to get around. S-traps are not allowed because they can create a siphon that leaves that seal partially open. A "P" trap,(see image) is the one most used today. This will result in an open airway from the sewer lines up through your sink which will allow noxious sewer gases to enter your home. The trap (and drain) can’t work properly without a properly installed vent in the system (see “Plumbing Vents Explained,” Jun/99). A P-trap means the waste outlet through a wall. S-Trap Uses. Skew Back Pans The following are a few alternatives to p-traps. If you're looking for durability in a P trap that needs replacing, you will find that one made of plastic is generally more durable than a metal one. Bathroom and kitchen waste traps or u bends remain a mystery to some people but the principle of the trap, be it a P trap, U bend, Gully trap, S trap, bottle trap, pedestal trap, shower or bath trap is exactly the same. While the setout of P-trap is the distance from the floor to the centre of the waste outlet on the wall. A: John Smith, a licensed plumber in Harwich, Mass., responds: Your plumber is correct in his assessment. The set out of a P-trap is a height measurement from the floor to the centre of the waste pipe. The design of a P-trap will keep the required amount of water is sitting in the trap which act as a barrier to the sewer gases. >E-mail Removed< Here you go! Easy Nirman: Comparison between P Trap and S Trap: trap must run horizontally on the outflow side. Or is it an S-trap? The P trap in conjunction with the vent ensures that enough water will remain behind to ensure the water plug does its job. The water in a plumbing trap creates a seal to keep out sewer gases. good. Expensive! The issue with S-Traps is 9k n rare occasions when a bunch of water goes down the drain it can pull all the water down the drain emptying the trap which would allow sewer gases to come out from the pipe which is toxic and flammable. A future project I have in mind is to redo the waste piping under our kitchen sink. problem is the bushing. The main purpose of any plumbing trap is to be able to create a water barrier. Compact Kitchen Remodel - Common Code Mistakes - Installing an Endless Pool, JLC Online: Best practices for professional builders and remodelers. i would swap out to a full 2'' trap and then just go with a mission band 2'' to 1.5'' tail piece. Another potential problem is that when draining, other plumbing units can cause a vacuum that will suck the water out of an S-trap. It is recommended to run all plumbing fixtures at least monthly in order to make sure that there traps remain full of water. Check to make sure that these devices are allowed in your local jurisdiction. There is no "J" trap but a "J" bend,(see image) is the removable part of a "P" trap. This is incorrect. It is used to connect two vertical pipes. It then loops over and exits downward. The typical P trap looks like a P if you envision the flat section of the letter P horizontally. Currently the sink and the washing machine outputs both go through the one 'P' trap (or maybe 'S' Trap, I can't remember and I'd need to dismantle stuff to find out) then along a single pipe out to the gully outside. Both work, personally I would fit a P. Their design makes them less vulnerable to drying out and losing seal: a properly installed P-trap will never lose its water seal. A vent allows air to move freely in the system, which in turn allows the trap to maintain that water seal. I haven’t responded to the client, but the 5 foot rule is a venting rule, and has nothing to do with defining if something is an s or p… When it comes to replacing a P trap in your bathroom or kitchen, making the wrong choice may result in your having to replace the new P trap again, sooner than you would like. S-Trap or P-Trap. A P-trap works with a vent to equalize air pressure and allow the trap to remain full of water. John Smith is a licensed plumber in Harwich, Mass. Considering the bottle trap and the P trap, what advantages does one have over the other, for use in a kitchen? that tips free bud. “metal” walls of this type of p-trap are great for household acids and high temperature liquids. A P-Trap toilet in an S-Trap world Hi guys, I once thought all toilets were the same, but now i have a funny smell in the bathroom and I discover the toilet I bought for a makeover a few years ago, and installed by someone else is a P-Trap, and the outlet is meant for an s-trap. The problem with an S-trap is that they have the tendency to siphon. The drain elbow for a p-trap fits into the drain pipe which goes directly into the wall. The set out for an S-trap is the distance from the wall to the centre of the pipe penetrating the floor. This image shows s-trap vs p-trap. The 'Bottle' trap takes up less space under a waste outlet and is ideal for pedestal mounted basins where space is usually very limited. For every 1/4 inch size of yr P-trap counts as a foot from the vent. Captain Leaky New Member. Even if you have P-traps installed, the water in the trap can dry out over time if the sink is not used. The exception may be a metal P trap made of heavy gauge brass. Chrome P-Trap: PROS. Any expert guidance would be much appreciated. This will result in an open airway from the sewer lines up through your sink which will allow noxious sewer gases to enter your home. Connection of a trap into another trap should not be practiced. 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