On a properly installed p trap there is a vent at the same place the drain turns downwards which breaks the siphon.
S trap with vent.
Named by its shape the s trap is mostly found in toilets on ground floors or the ones where the pipes are installed through the floor.
S trap what is it and how does it work.
S trap and venting.
A p trap is for a drain in the wall that is teed for a vent stack.
The fix involves adding a p trap and a studor vent.
Venting allows water to pass out of the drains easily.
Today houses are vented through the roof.
Vents are a major component in a home s drainage system.
The major disadvantage comes because s traps are usually used in locations where they are either not vented or poorly vented on the outflow side and so can siphon off the water in the trap leading to sewer gas backing up into the building.
A studor vent is a small device that attaches to the drain pipe and will allow some air in and allow venting but will not allow sewer stink out.
Back to s traps the reason s traps aren t allowed is because they have the potential to suck or siphon water out of the trap as the water flows down the drain.
You can turn an s trap into a p trap by adding this.
Dlh tx the problem is is the trap will still be siphoned even if it is 2.
If you re in the ipc there is no limitation in length for the toilet s trap arm.
For this reason s traps were the prevalent type for many years.
You need some type of vent and an aav air admittance valve which is what you described would be ok if your area allows them although i and others would prefer a loop vent for your situation but is about impossible without major demolition.
Roof flashing made from heavy grade rubber lead or sheet metal holds the vent pipe in place.
The toilet s trap arm length aka trap to vent distance.
Now that you know all the benefits of a plumbing trap here comes the fun part more about s trap.
We talk about plumbing s traps and why you should avoid using these s.
The toilet s trap arm also referred to as the fixture drain is the pipe between the trap and the vent.
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.