S Trap vs P Trap: The Main Purpose of All Drain Traps. 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). 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. 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 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. 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. “metal” walls of this type of p-trap are great for household acids and high temperature liquids. It is used to connect two vertical pipes. 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… A "P" trap,(see image) is the one most used today. S-Trap Uses. A P flows better, a bottle uses less space. 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 bottle trap essentially uses a P-trap-style bend … As water flows from the sink into the drain, air is pushed out of the pipe via 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. But an S-trap loops back down with no way for air to get into the pipe. ✦ S-Trap:The s-trap, as the name suggests, has two oppositely curved sections, which together form an ‘S’. A P-trap means the waste outlet through a wall. Understand the S trap is found in most toilets. Even if you have P-traps installed, the water in the trap can dry out over time if the sink is not used. Said it’s actually a p-trap, because the vent is within 5 feet of the weir. The horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. The main purpose of any plumbing trap is to be able to create a water barrier. Check to make sure that these devices are allowed in your local jurisdiction. But an S-trap loops back down with no way for air to get into the pipe. Have your plumber remove the S-trap and install a P-trap that exits through the back of the cabinet and into the wall. John Smith is a licensed plumber in Harwich, Mass. So a 1 inch 1/2 trap can only be 6ft from the vent. Any expert guidance would be much appreciated. Considering the bottle trap and the P trap, what advantages does one have over the other, for use in a kitchen? P Trap containing water and indicating incoming and outgoing water. Again picture a P on its side. The water in a plumbing trap creates a seal to keep out sewer gases. 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 horizontal run of a P-trap allows water to drain and air to move in the pipe to maintain the trap seal. Basiclly, an S-trap is designed to outlet directly through the floor. Sarasota FL Home Inspector | Direct Inspections | 941-251-1000, Copyright © 2020 - Direct Inspections - All Rights Reserved, Proudly Serving Sarasota & Manatee Counties. Likewise, a p-trap resembles a sideways “P”. A plumbing trap is supposed to stay full of water to seal the pipe and block sewer gases from escaping through the drain. InterNACHI® is a registered trade­mark of the Inter­national Association of Certified Home Inspectors S-Trap or P-Trap. ✦ Bottle Trap:Unlike t… If rerouting the drain isn’t feasible, you may be allowed to install an air admittance valve. 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. A p-trap is comprised of a tailpiece, the curved trap piece, and a drain elbow. There is no "J" trap but a "J" bend,(see image) is the removable part of a "P" trap. 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 problem with an S-trap is that they have the tendency to siphon. The waste pipe is always fitted horizontally. S-traps may violate code requirements. Re: Is this a legal P-trap? P-Trap Pans. 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