Sink plumbing diagram

An illustrated guide to how kitchen plumbing systems work, including water pipes to the sink and the stove's gas line.

Venting a kitchen sink under a window is relatively simple. Here's our handy guide for how to vent a kitchen sink under a window.

The popups have never worked properly on our bathroom sinks, so I decided to fix them. I hadn't looked at these traps before, and this just doesn't...

See the drains & vents come together inside this bathroom. Includes pipe sizes for both major U.S. Plumbing Codes (IPC and UPC).

When a trap connects to a vertical drain, install a tee fitting. A “sanitary tee” gives the waste arm a slight downward slope, enough for good flow, but not enough to create a siphon.

I am finishing my basement, where we had the builder put a drain line in for a kitchenette. I am wanting to also put in a second laundry in the...

How to add AAV air admittance valve

A kitchen sink drain needs to be vented so as to prevent clogging and ensure free flow of water and liquids from the sink. also, venting a kitchen sink allows air to enter behind the water that is flowing out. This prevents debris, oil, and fat, from sticking on the wall of the drain. This also helps prevent gurgles and glugs.

How bathroom sink plumbing works, including a diagram of the drain plumbing assembly

As you can see in the photo, in a bath remodel, our contractor has installed a new shower drain at a new shower stall location so that it drains...