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New Whalers use some kind of plastic, perhaps Marelon(?), hull and locker drains. They seem to function as well as brass tubes, don't use O-rings and are very durable. From what I can tell just from looking the drains appear to be seated in/sealed with a marine grade, below the waterline caulk such as that marked by 3M and Boat Life.

I believe the new drains are certainly equal to if not superior to the old. I am no longer able to do demanding hand work so have to pay someone if our boat's drains need replacement. Being a light spender I want the simplest least costly solution so will use the new style if they will fit our Sport 13. Purists will demand brass.