Occasionally the plumbing under a sink is an “S” trap. Their design makes them less vulnerable to drying out and losing seal: a properly installed P-trap will never lose its water seal. Any expert guidance would be much appreciated. S Trap vs P Trap: The Main Purpose of All Drain Traps. 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 horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. The trap (and drain) can’t work properly without a properly installed vent in the system (see “Plumbing Vents Explained,” Jun/99). 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. Personally cant stand bottle traps, flow is dissipated around the bottle and allows gunk to build up, whereas a 'P' or 'S' trap will always be full flow, and provided the sink is kept clean and regular maintenance with boiling water and/or soda crystals is carried out to prevent build up of crud, it'll be rare there's an issue. 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. Have your plumber remove the S-trap and install a P-trap that exits through the back of the cabinet and into the wall. Various p-traps. 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. A p-trap is comprised of a tailpiece, the curved trap piece, and a drain elbow. Take the letter P and turn it 90 degrees clockwise. It is recommended to run all plumbing fixtures at least monthly in order to make sure that there traps remain full of water. This image shows s-trap vs p-trap. 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. 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. Easy Nirman: Comparison between P Trap and S Trap: trap must run horizontally on the outflow side. Basically these two have the same purpose, but not in usage. The exception may be a metal P trap made of heavy gauge brass. Or is it an S-trap? InterNACHI® is a registered trade­mark of the Inter­national Association of Certified Home Inspectors Also, a P-trap is probably better if you have a choice-- S-traps can siphon dry even when apparently vented properly (you want some water to remain in the trap at all times to prevent unpleasant--and possibly dangerous-- sewer/septic gas from rising up through the pipes). It is used to connect two vertical pipes. P-traps are generally considered by most to be more effective and consistent in maintaining water trap compared to S-traps. A plumbing trap is supposed to stay full of water to seal the pipe and block sewer gases from escaping through the drain. While the setout of P-trap is the distance from the floor to the centre of the waste outlet on the wall. Sarasota FL Home Inspector | Direct Inspections | 941-251-1000, Copyright © 2020 - Direct Inspections - All Rights Reserved, Proudly Serving Sarasota & Manatee Counties. S-Trap Uses. P Trap containing water and indicating incoming and outgoing water. Even if you have P-traps installed, the water in the trap can dry out over time if the sink is not used. So a 1 inch 1/2 trap can only be 6ft from the vent. good. However, like the p-trap, it too requires a lot of space. The drain elbow for a p-trap fits into the drain pipe which goes directly into the wall. A vent allows air to move freely in the system, which in turn allows the trap to maintain that water seal. If rerouting the drain isn’t feasible, you may be allowed to install an air admittance valve. 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. Why is an S-trap bad, and what’s the best way to retrofit a P-trap? >E-mail Removed< Here you go! Due to this, they cannot efficiently do their job of keeping the sewer gases at bay. In fact, in some countries, like the United States the S traps are no longer accepted by the plumbing codes and can even be deemed illegal. 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. S-traps are now against plumbing code. However, P Traps are often preferred over S traps, as S traps have the tendency to easily dry out even when they are well-vented. The water in a plumbing trap creates a seal to keep out sewer gases. The horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. Both work, personally I would fit a P. perfectly legal and much easier to snake as the 2'' trap is easier to get around. An s-trap is so-called because of its general shape, which looks like an “S”. A P-trap means the waste outlet through a wall. A future project I have in mind is to redo the waste piping under our kitchen sink. With an S-trap, the drainpipe drops down from the sink and into a conventional trap. But an S-trap loops back down with no way for air to get into the pipe. A P-trap toilet’s waste pipe will go through a wall instead of through the floor. Cause there's on 6 1/4 inches in 1 inch 1/2 trap. CONS. Hi Team, I called out an ‘s-trap’ and the builders plumber re-looked at it. 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There is no "J" trap but a "J" bend,(see image) is the removable part of a "P" trap. Chrome P-Trap: PROS. S-Trap or P-Trap. A common style is the P-trap, which is highly effective and common. The problem with an S-trap is that they have the tendency to siphon. In other words if your installing a wall-mount sink your plumbing is gonna show, so you would want to go with this type p-trap. Captain Leaky New Member. The setout of S-trap is the distance from the wall to the centre of the waste pipe in the floor. The P trap in conjunction with the vent ensures that enough water will remain behind to ensure the water plug does its job. S-traps may violate code requirements. Likewise, a p-trap resembles a sideways “P”. 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. Basiclly, an S-trap is designed to outlet directly through the floor. 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. A "P" trap,(see image) is the one most used today. This image shows s-trap vs p-trap. Compact Kitchen Remodel - Common Code Mistakes - Installing an Endless Pool, JLC Online: Best practices for professional builders and remodelers. A p-trap can be used weather the drain line comes from the floor or the wall. This is incorrect. Another potential problem is that when draining, other plumbing units can cause a vacuum that will suck the water out of an S-trap. The typical P trap looks like a P if you envision the flat section of the letter P horizontally. The problem with an S-trap is that they have the tendency to siphon. 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. The bottle trap essentially uses a P-trap-style bend … Like the 'P' trap, the 'S' also requires a fair amount of room around the waste outlet. Before discussing the drawbacks to an S-trap, we first need to understand how sink traps operate. If enough water (say a sinkful) drains through an S-trap, a siphon can be created that sucks water out of the trap, leaving it partially open and unable to seal out sewer gases. The main purpose of any plumbing trap is to be able to create a water barrier. Understand the S trap is found in most toilets. I just to know if the p trap flows better one way or the other? A P flows better, a bottle uses less space. Diameter of the trap shall in no case be smaller than the diameter of the outlet of the fixture, to which it is connected. “metal” walls of this type of p-trap are great for household acids and high temperature liquids. that tips free bud. As water flows from the sink into the drain, air is pushed out of the pipe via the vent. ✦ S-Trap:The s-trap, as the name suggests, has two oppositely curved sections, which together form an ‘S’. 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. Connection of a trap into another trap should not be practiced. But an S-trap loops back down with no way for air to get into the pipe. Skew Back Pans The waste pipe is always fitted horizontally. ✦ Bottle Trap:Unlike t… It then loops over and exits downward. i would swap out to a full 2'' trap and then just go with a mission band 2'' to 1.5'' tail piece. Looks pretty! The problem with an S-trap is that they have the tendency to siphon. Again picture a P on its side. 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 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. Setout . Said it’s actually a p-trap, because the vent is within 5 feet of the weir. A P-trap works with a vent to equalize air pressure and allow the trap to remain full of water. The set out for an S-trap is the distance from the wall to the centre of the pipe penetrating the floor. Re: Is this a legal P-trap? Codes require a p-trap (or an s-trap) any place there is an open drain line that flows into the drain-waste-vent system. However, sometimes, reasons such as lack of space or a typical arrangement of pipes may require one to explore other options. The following are a few alternatives to p-traps. Traps should be of self-cleansing design with uniform bore and shall not be dependent on internal partitions or other movable parts for retention of water seal. The p-trap does this effectively. John Smith is a licensed plumber in Harwich, Mass. Have heard and seen the terms S trap, P trap and J trap used. For every 1/4 inch size of yr P-trap counts as a foot from the vent. The 'Bottle' trap, access to clean the trap is by unscrewing the bottom. Have no clear idea of the difference between the three. Q: On a current kitchen remodel, the sink has an S-trap instead of a P-trap, which my plumber says does not meet code. S-Trap vs. P-Trap: S-trap vs. P-trap. In simplest terms, an S-trap is shaped like an “S” and a P-trap is shaped like the letter “P” if both are lying on their side (see S-Traps Vs. P-Traps, below). The S-trap is used when the piping runs underneath the floor because it cannot retain … It's through piping bends and curves that some water remains behind to block odors and sewer gases that can reenter the bathroom. Looking at the p trap that is not glue-together, the sweep is on the drain side, but look at the image i uploaded, the height to the j-bend does not apply in my case since one side of the p trap is not higher than the other. The set out of a P-trap is a height measurement from the floor to the centre of the waste pipe. The 'Bottle' trap takes up less space under a waste outlet and is ideal for pedestal mounted basins where space is usually very limited. starbuild, Nov 8, 2010 #1. The design of a P-trap will keep the required amount of water is … 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. 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