GROCO 1-Inch Bronze Combo Scoop Thru-Hull Fitting

The GROCO STH-1000-W is a combo scoop thru-hull intended for intake systems that benefit from water being presented to the opening while the boat is moving. Its scoop-shaped exterior profile is designed to increase water delivery compared with a plain open thru-hull. That makes the fitting useful for applications such as engine cooling, livewell circulation, or other equipment whose intake must remain supplied underway. A retaining nut is included for a secure through-hull installation.

The STH-1000-W uses C83600 bronze and a combination NPSM/NPT threaded body for connection to compatible marine plumbing. The external pickup geometry is integral to the fitting, so the water-facing orientation matters during installation. The installer should still match the fitting to the pump or engine's actual flow requirements rather than selecting a scoop solely by physical size. Compared with building an intake from a plain thru-hull plus a separate scoop, the combined design keeps the hull-side hardware more compact.

• Combo scoop intake geometry
• Retaining nut included for installation
• Combination NPSM/NPT threaded connection
• Designed for moving-water intake service

Orient the STH-1000-W correctly to the direction of travel before drilling or bedding the fitting, and verify that the inside plumbing has a clear path to the intake equipment. Support the connected hose or valve so hull movement and vibration do not work against the penetration. After launch, inspect the fitting from inside the vessel and confirm the connected system receives water normally at both idle and operating speed. For other intake fittings, hull strainers, and drain components, browse Thru-Hulls & Drains.