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

The GROCO 2" Bronze High Speed Thru-Hull Fitting w/Nut is engineered for serious boaters who demand reliability and efficiency below the waterline. After years on the water, any experienced angler knows that thru-hull fittings are critical infrastructure—they manage raw water intake, cooling systems, and discharge with zero room for failure. This bronze fitting addresses a fundamental challenge: standard thru-hulls create unnecessary drag and restrict flow, compromising cooling efficiency and adding parasitic resistance to your hull. GROCO's high-speed design solves this problem with optimized internal geometry that increases flow while reducing turbulence and pressure drop.

Cast from C83600 bronze, this fitting delivers superior corrosion resistance in saltwater and freshwater environments—a material choice that outlasts inferior alternatives by years. The 2-inch diameter accommodates substantial flow rates without choking engine cooling systems or live-well circulation. The NPSM/NPT combination thread design provides dual-threaded compatibility, allowing installation into both straight pipe and tapered pipe connections without adapters. The integral nut secures installation from inside the hull, and the streamlined intake profile minimizes vortexing and silt disturbance, which is crucial when drawing from shallow or turbid water. Bronze won't spark or degrade under galvanic stress like lesser materials, making it the uncompromising choice for saltwater vessels and long-term reliability.

This fitting serves captains and serious anglers who run engines hard and depend on consistent cooling—from center console offshore boats to commercial fishing vessels. Installation requires standard hull penetration; the compact 4 x 4 x 5-inch footprint fits most through-hull locations without structural modification. Ideal for raw water cooling loops, live-well systems, and bilge pump intake applications, it delivers measurable cooling improvement and reduced operating temperatures. Weighting 1.7 pounds of solid bronze, it installs once and performs reliably for decades with minimal maintenance.