Replacement Sink Drain And How To Determine The Correct Sizing

Question:

Will this fit a 2inch drain hole? That is the size of the opening in my RV sink.

asked by: Joshua

Expert Reply:

Hi Joshua,

The Valterra Threaded RV Sink Drain # A01-2012VP is designed to fit 1-3/4" diameter drains. You can more easily measure the drain hole from the bottom of the sink, but you might need to untighten the nut for the drain in order get an exact measurement. If you do end up having a 2" drain you can use a sink drain like part # 37295325.

expert reply by: Kevin C

Joshua

3/25/2024

Hi Kevin, Thank you for the quick reply. Do you have a drain trap for the 2" drain you linked above? Mine currently has a trap that looks like this one: https://www.etrailer.com/RV-Sewer-Hose-Fittings/JR-Products/37295195.html

Kevin C.

3/25/2024

@Joshua The traps we offer like part # 37295195 are designed to run directly to an exterior drain line, usually just a 3/4" diameter garden hose. Your sink should have a P-Trap like part # LSB76XR to prevent smells from the plumbing lines from coming up out of the drain. The # 37295325 is designed to run to a 1-1/2" drain pipe and connect to a P-Trap with a 1-1/2" opening like the # LSB76XR.