The bottle trap essentially uses a P-trap-style bend … 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 just to know if the p trap flows better one way or the other? A plumbing trap is supposed to stay full of water to seal the pipe and block sewer gases from escaping through the drain. This is incorrect. starbuild, Nov 8, 2010 #1. rick. problem is the bushing. So a 1 inch 1/2 trap can only be 6ft from the vent. 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. Looks pretty! S Trap vs P Trap: The Main Purpose of All Drain Traps. 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. S-Trap Uses. ✦ S-Trap:The s-trap, as the name suggests, has two oppositely curved sections, which together form an ‘S’. Have no clear idea of the difference between the three. Expensive! it's a double fixture fitting. Chrome P-Trap: PROS. 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). i would swap out to a full 2'' trap and then just go with a mission band 2'' to 1.5'' tail piece. CONS. The exception may be a metal P trap made of heavy gauge brass. perfectly legal and much easier to snake as the 2'' trap is easier to get around. John Smith is a licensed plumber in Harwich, Mass. 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. Hi Team, I called out an ‘s-trap’ and the builders plumber re-looked at it. 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. However, sometimes, reasons such as lack of space or a typical arrangement of pipes may require one to explore other options. 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. While the setout of P-trap is the distance from the floor to the centre of the waste outlet on the wall. A "P" trap,(see image) is the one most used today. The p-trap does this effectively. The problem with an S-trap is that they have the tendency to siphon. A P-trap works with a vent to equalize air pressure and allow the trap to remain full of water. Occasionally the plumbing under a sink is an “S” 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. A P-trap means the waste outlet through a wall. Easy Nirman: Comparison between P Trap and S Trap: trap must run horizontally on the outflow side. Both work, personally I would fit a P. 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 can be used weather the drain line comes from the floor or the wall. The S-trap is used when the piping runs underneath the floor because it cannot retain … 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. Sarasota FL Home Inspector | Direct Inspections | 941-251-1000, Copyright © 2020 - Direct Inspections - All Rights Reserved, Proudly Serving Sarasota & Manatee Counties. An s-trap is so-called because of its general shape, which looks like an “S”. 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. S-Trap vs. P-Trap: S-trap vs. P-trap. Have heard and seen the terms S trap, P trap and J trap used. ✦ Bottle Trap:Unlike t… 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. Captain Leaky New Member. Cause there's on 6 1/4 inches in 1 inch 1/2 trap. But an S-trap loops back down with no way for air to get into the pipe. As water flows from the sink into the drain, air is pushed out of the pipe via the vent. 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. >E-mail Removed< Here you go! The set out of a P-trap is a height measurement from the floor to the centre of the waste pipe. Skew Back Pans A P-trap toilet’s waste pipe will go through a wall instead of through the floor. P-traps are generally considered by most to be more effective and consistent in maintaining water trap compared to S-traps. Likewise, a p-trap resembles a sideways “P”. 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. Check to make sure that these devices are allowed in your local jurisdiction. good. Again picture a P on its side. The problem with an S-trap is that they have the tendency to siphon. Basically these two have the same purpose, but not in usage. Various p-traps. S-traps are now against plumbing code. The 'Bottle' trap, access to clean the trap is by unscrewing the bottom. 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. Compact Kitchen Remodel - Common Code Mistakes - Installing an Endless Pool, JLC Online: Best practices for professional builders and remodelers. The following are a few alternatives to p-traps. A vent allows air to move freely in the system, which in turn allows the trap to maintain that water seal. The drain elbow for a p-trap fits into the drain pipe which goes directly into the wall. 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. A P flows better, a bottle uses less space. Understand the S trap is found in most toilets. However, like the p-trap, it too requires a lot of space. Take the letter P and turn it 90 degrees clockwise. 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. If rerouting the drain isn’t feasible, you may be allowed to install an air admittance valve. There is no "J" trap but a "J" bend,(see image) is the removable part of a "P" trap. The typical P trap looks like a P if you envision the flat section of the letter P horizontally. The horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. It then loops over and exits downward. The problem with an S-trap is that they have the tendency to siphon. 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. This image shows s-trap vs p-trap. Re: Is this a legal P-trap? Before discussing the drawbacks to an S-trap, we first need to understand how sink traps operate. The horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. S-traps may violate code requirements. A p-trap is comprised of a tailpiece, the curved trap piece, and a drain elbow. S-traps are not allowed because they can create a siphon that leaves that seal partially open. S-Trap or P-Trap. Or is it an S-trap? Any expert guidance would be much appreciated. 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). Diameter of the trap shall in no case be smaller than the diameter of the outlet of the fixture, to which it is connected. Setout . The trap (and drain) can’t work properly without a properly installed vent in the system (see “Plumbing Vents Explained,” Jun/99). Said it’s actually a p-trap, because the vent is within 5 feet of the weir. Connection of a trap into another trap should not be practiced. 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. The P trap in conjunction with the vent ensures that enough water will remain behind to ensure the water plug does its job. A future project I have in mind is to redo the waste piping under our kitchen sink. 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… The setout of S-trap is the distance from the wall to the centre of the waste pipe in the floor. 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. It is used to connect two vertical pipes. 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. “metal” walls of this type of p-trap are great for household acids and high temperature liquids. The water in a plumbing trap creates a seal to keep out sewer gases. The waste pipe is always fitted horizontally. Their design makes them less vulnerable to drying out and losing seal: a properly installed P-trap will never lose its water seal. 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 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. Due to this, they cannot efficiently do their job of keeping the sewer gases at bay. But an S-trap loops back down with no way for air to get into the pipe. Considering the bottle trap and the P trap, what advantages does one have over the other, for use in a kitchen? 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. 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