An island sink presents a unique plumbing problem: Like all drains, the sink drain has to be vented to allow air into the pipes to equalize pressure, but how do you connect it to the building’s ...

Ask the Builder: Using the humble plumbing loop vent for kitchen islands Sat., Aug. 20, 2022 This is the magic of a time-tested plumbing loop vent for island sinks. Don’t take the shortcut using ...

The short horizontal pipe draining your kitchen sink needs to be a smaller 1.5-inch pipe to restrict the amount of water entering the loop vent. The loop vent system looks like the giant letter P ...