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. 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. S Trap vs P Trap: The Main Purpose of All Drain Traps. starbuild, Nov 8, 2010 #1. He can then either tie into an existing vent or run a new vent up through a stud bay and through the roof. good. 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. 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. But an S-trap loops back down with no way for air to get into the pipe. Sarasota FL Home Inspector | Direct Inspections | 941-251-1000, Copyright © 2020 - Direct Inspections - All Rights Reserved, Proudly Serving Sarasota & Manatee Counties. Re: Is this a legal P-trap? The drain elbow for a p-trap fits into the drain pipe which goes directly into the wall. Connection of a trap into another trap should not be practiced. Likewise, a p-trap resembles a sideways “P”. 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. Both work, personally I would fit a P. 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. John Smith is a licensed plumber in Harwich, Mass. An s-trap is so-called because of its general shape, which looks like an “S”. Captain Leaky New Member. The main purpose of any plumbing trap is to be able to create a water barrier. Like the 'P' trap, the 'S' also requires a fair amount of room around the waste outlet. The P trap in conjunction with the vent ensures that enough water will remain behind to ensure the water plug does its job. As water flows from the sink into the drain, air is pushed out of the pipe via the vent. But an S-trap loops back down with no way for air to get into the pipe. The exception may be a metal P trap made of heavy gauge brass. Take the letter P and turn it 90 degrees clockwise. A: John Smith, a licensed plumber in Harwich, Mass., responds: Your plumber is correct in his assessment. Various p-traps. Looks pretty! A P-trap toilet’s waste pipe will go through a wall instead of through the floor. rick. 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. 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… 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. The horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. 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. It then loops over and exits downward. Considering the bottle trap and the P trap, what advantages does one have over the other, for use in a kitchen? Their design makes them less vulnerable to drying out and losing seal: a properly installed P-trap will never lose its water seal. InterNACHI® is a registered trade­mark of the Inter­national Association of Certified Home Inspectors The S-trap is used when the piping runs underneath the floor because it cannot retain … 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. The typical P trap looks like a P if you envision the flat section of the letter P horizontally. 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. S-Trap Uses. If rerouting the drain isn’t feasible, you may be allowed to install an air admittance valve. The waste pipe is always fitted horizontally. Cause there's on 6 1/4 inches in 1 inch 1/2 trap. The 'Bottle' trap, access to clean the trap is by unscrewing the bottom. It is recommended to run all plumbing fixtures at least monthly in order to make sure that there traps remain full of water. 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. problem is the bushing. “metal” walls of this type of p-trap are great for household acids and high temperature liquids. S-traps may violate code requirements. Occasionally the plumbing under a sink is an “S” trap. The problem with an S-trap is that they have the tendency to siphon. It's through piping bends and curves that some water remains behind to block odors and sewer gases that can reenter the bathroom. A "P" trap,(see image) is the one most used today. 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Check to make sure that these devices are allowed in your local jurisdiction. Have your plumber remove the S-trap and install a P-trap that exits through the back of the cabinet and into the wall. i would swap out to a full 2'' trap and then just go with a mission band 2'' to 1.5'' tail piece. Skew Back Pans 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. Chrome P-Trap: PROS. P Trap containing water and indicating incoming and outgoing water. 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. Compact Kitchen Remodel - Common Code Mistakes - Installing an Endless Pool, JLC Online: Best practices for professional builders and remodelers. 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). Basiclly, an S-trap is designed to outlet directly through the floor. The following are a few alternatives to p-traps. CONS. It is used to connect two vertical pipes. S-traps are now against plumbing code. 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 set out of a P-trap is a height measurement from the floor to the centre of the waste pipe. The problem with an S-trap is that they have the tendency to siphon. perfectly legal and much easier to snake as the 2'' trap is easier to get around. S-Trap or P-Trap. A vent allows air to move freely in the system, which in turn allows the trap to maintain that water seal. However, like the p-trap, it too requires a lot of space. Basically these two have the same purpose, but not in usage. The design of a P-trap will keep the required amount of water is … it's a double fixture fitting. This is incorrect. 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). Diameter of the trap shall in no case be smaller than the diameter of the outlet of the fixture, to which it is connected. A plumbing trap is supposed to stay full of water to seal the pipe and block sewer gases from escaping through the drain. Before discussing the drawbacks to an S-trap, we first need to understand how sink traps operate. Another potential problem is that when draining, other plumbing units can cause a vacuum that will suck the water out of an S-trap. Have no clear idea of the difference between the three. 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. While the setout of P-trap is the distance from the floor to the centre of the waste outlet on the wall. >E-mail Removed< Here you go! With an S-trap, the drainpipe drops down from the sink and into a conventional trap. Easy Nirman: Comparison between P Trap and S Trap: trap must run horizontally on the outflow side. ✦ S-Trap:The s-trap, as the name suggests, has two oppositely curved sections, which together form an ‘S’. There is no "J" trap but a "J" bend,(see image) is the removable part of a "P" trap. This image shows s-trap vs p-trap. A P-trap means the waste outlet through a wall. The water in a plumbing trap creates a seal to keep out sewer gases. I just to know if the p trap flows better one way or the other? 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