GROCO 2-1/2" Bronze Combo Scoop Thru-Hull w/Nut

The GROCO 2-1/2" Bronze Combo Scoop Thru-Hull w/Nut is a marine-grade intake fitting engineered for anglers, cruisers, and boaters who demand reliable through-hull performance in saltwater and freshwater environments. This combo scoop design serves as both a through-hull fitting and water intake valve, eliminating the need for separate components and reducing clutter in engine rooms and live wells. Built for vessels requiring consistent coolant or raw water circulation, the 2-1/2" bore handles significantly higher flow rates than standard through-hulls, making it ideal for larger sportfish platforms, commercial workboats, and cruising yachts.

Manufactured from C83600 bronze—a corrosion-resistant copper-tin alloy proven in marine service—the GROCO fitting resists saltwater oxidation and maintains structural integrity across temperature extremes. The NPSM/NPT combination thread provides dual compatibility, accommodating both National Pipe Straight Mechanical and National Pipe Tapered fittings common in marine plumbing systems. The integrated scoop design maximizes intake efficiency while minimizing turbulence, critical when cooling high-output engines or maintaining steady raw water flow to through-hull ventilation systems.

This fitting is essential for retrofit installations, engine upgrades, or replacement of failed through-hull assemblies on boats where standard 2-inch fittings prove undersized. Installation requires drilling a 2-1/2" hole through the hull below the waterline, setting the fitting with the included nut, and sealing with marine-grade silicone or epoxy. Both fiberglass and aluminum hulls benefit from GROCO's proven design—used by naval architects and marine mechanics for over four decades. Verify your hull thickness and skin configuration before ordering to ensure proper nut seating and long-term reliability.