Sink Waste/Drain SW-1.

Features:
Straight configuration
1" inside Dia. tubing
1 3/4" flange
1 5/16" cut-out

Note: Forespar threaded plumbing fittings, like most true marine plumbing fittings, use NPSM threads (National Standard Free-Fitting Straight Mechanical Pipe Thread). NPT (National Pipe Threads) are tapered, NPSM Threads are parallel. The two types are not designed to work together.