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

The GROCO 1" Bronze Combo Scoop Thru-Hull with Nut is a marine through-hull fitting engineered for applications requiring superior water flow compared to standard through-hull designs. Constructed from C83600 bronze—a marine-grade alloy selected for corrosion resistance in saltwater environments—this fitting accommodates both NPSM (National Pipe Straight Mechanical) and NPT (National Pipe Tapered) threads, making it compatible with a wider range of hull penetration applications aboard cruising and fishing vessels.

The scoop design increases flow rates by presenting a larger intake area to the water column, reducing turbulence and improving suction at slower vessel speeds—a critical advantage when running engine cooling systems, live wells, or raw-water washdown pumps at reduced rpm. The 1-inch NPSM/NPT combination threading accepts standard marine hose barbs, reducing the need for adapters and simplifying installation. Bronze construction resists dezincification and maintains structural integrity in the corrosive salt-air environment for years without degradation, eliminating the maintenance burden of inferior ferrous materials.

Weekend anglers upgrading cooling systems or installing new through-hull applications, and serious offshore operators managing multiple water systems, both benefit from this fitting's flow efficiency and durability. The included nut simplifies fastening during hull installation, reducing assembly time and potential for loose fittings during rough seas.

GROCO through-hull fittings are recognized across the marine industry for dimensional consistency and material reliability, making them a standard choice for OEM and refit applications where water system performance and longevity cannot be compromised.