GROCO 2" Bronze Extra Long High Speed Thru-Hull Fitting w/Nut

The GROCO 2" Bronze Extra Long High Speed Thru-Hull Fitting w/Nut is engineered for serious boaters and commercial operators who demand maximum flow efficiency without sacrificing hull integrity. This fitting serves as the backbone of through-hull seawater intake systems, cooling systems, and discharge applications where standard thru-hulls create unnecessary drag and restrict vital flow rates. Built to the exacting standards GROCO established over decades, this extra-long configuration is purpose-built for vessels requiring superior hydraulic performance in demanding marine environments.

Constructed from C83600 bronze—a marine-grade copper alloy prized for corrosion resistance in saltwater and brackish conditions—this thru-hull fitting incorporates a high-speed design that reduces turbulence and drag compared to conventional models. The extra-long NPSM/NPT combination thread accommodates varied hull thicknesses and installation scenarios without requiring adapters or reducers, simplifying both new builds and retrofit installations. Bronze's natural antimicrobial properties inhibit marine growth within the fitting, maintaining consistent flow rates over extended service intervals and reducing maintenance requirements.

This 2-inch fitting is ideal for larger vessels—fishing boats, cruisers, yachts, and commercial craft—where engine cooling, seawater washdown, live wells, and through-deck discharge systems demand uncompromised flow capacity. The included nut ensures a watertight seal when properly installed with appropriate backing plates and sealant. Professional installers and experienced boat owners recognize the GROCO brand as the standard for reliability; this fitting will outlast multiple generations of hull systems when installed correctly through the vessel's side or transom.