It should go without saying but when doing below the waterline seacock/sea valve work the parts should be UL Marine labeled.


Groco, Spartan, Forespar/Marelon, Apollo/Conbraco, Buck Algonquin and others all sell UL Marine rated seacocks & valves. If it does not say UL Marine, or come from a legitimate manufacturer, you would be best to purchase other products that do meet the stringent UL Marine testing standards.