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Groco Bronze Thru-Hull Fittings are threaded with NPS (straight) male pipe thread, and are for use with Groco Seacocks or with any product with straight female pipe thread.
Groco Bronze Thru-Hull Fittings are the best choice for below-the-waterline use. They are supplied complete with a bronze locknut or they may be threaded directly into a compatible seacock.