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I have the inspector coming tomorrow to test the water supply (100 psi for 2 hours) and drainage pipes (static water pressure for 15 minutes). I plugged all the drains in all the right spots, filled the whole system with water from the roof vent. I waited a while to let the air escape from the...

I need to pressure test a small drainage system with air or water and the p-traps are already installed. The 4 and 3 inch lines I can block with the test caps that expand with a screw, But no stores around here have 1 1/2 rubber test caps Question 1: Can I make "halfs of p-traps with a cap on...

Our fire department requires firestopping collars around any ABS pipe that goes through walls and ceilings. But, they don't require collars on PVC pipe 3" or smaller. I have a 2" pipe going down in the floor and then immediately to a 90 elbow in the basement, and into a 9 foot horizontal pipe...

Is it OK to start a vent off the 45 side of a wye? I don't see why it wouldn't but couldn't find an example of my situation on the internet, See attached drawing (sorry it's rotated wrong), Originally I was going to put a sani-tee after the trap arm start and start the vent with a 45 from the...