A question for all of you on the sink drain

[bill@ariel231]

I used the 1.5" seacocks for my cockpit drains and head discharge (for offshore), 1.0" for the engine intake, 3/4" for the head raw water intake.

all of my seacocks are forespar marelon flanged seacocks mounted with backing blocks, thru bolts and bedded in 3M 5200.

I don't about how to test the 500# requirement, but I can tell you that when i changed out my first set of marelon 1.5" seacocks under the cockpit**, removal required a reciprocating saw, a propane torch, a 3/4" drum sander and the angle grinder.

note: ** from this experience, i recommend you buy new seacocks, free leftovers from other people's projects are no bargain