A sink drain always includes a “trap” that fills with water to prevent sewer gasses from rising into the house.

Kitchen and bathroom sinks are connected to a home’s water supply system, which supplies the faucets, and to a home’s drain-waste-vent (DWV) system for the drains.

How do you install double sink plumbing?

How do you install a P trap under a kitchen sink?

How to Install the P-Trap under a Sink

• Slide the short side of the P-trap onto the tailpiece that drops down from the sink drain.
• Take the lower part of the P-trap apart and insert the trap arm into the wall drain fitting as far as it will go.
• Pull the trap arm out of the wall fitting until it lines up with the top U-shaped portion of the trap.

What is the rough in height for kitchen sink drains?

In the bathroom, the sink drain is typically between 24 inches above the floor. Rough-in plumbing is usually placed at a somewhat lower height, between 18 and 20 inches, to accommodate varying counter heights and sink depths and leave plenty of space for the P-trap and necessary connections.