GROCO 3/4" Bronze Extra Long Thru-Hull Fitting w/Nut

The GROCO 3/4" Bronze Extra Long Thru-Hull Fitting w/Nut is a marine-grade through-hull assembly designed for serious cruisers, live-aboard boaters, and anglers who demand reliability below the waterline. This fitting is essential for applications such as raw-water cooling systems, through-hull exhaust installations, and seacock setups for bilge or head discharge.

Constructed from marine-grade bronze, this fitting is engineered to resist dezincification and galvanic corrosion, ensuring durability in both saltwater and freshwater environments. The extra-long design accommodates thicker hull materials and composite constructions, eliminating the need for spacers or adapters that can introduce weak points. The included nut ensures a watertight seal against the hull exterior.

With a fitting size of 3/4 inch, it suits the majority of through-hull applications on boats ranging from 25 to 60+ feet. At a verified weight of 0.8 lbs and measuring 7 inches in length, this fitting provides the necessary reach for various plumbing configurations without requiring custom fabrication. Experienced boaters and marine technicians trust GROCO thru-hulls for reliable replacements, upgrades, and new installations.