When plumbing marine critical infrastructure—such as engine cooling intakes, livewell pumps, and sanitation systems—the connections are only as secure as their weakest adapter. The Groco Bronze Full-Flow Threaded Pipe-to-Hose Barb Adapter is engineered by the global leaders in marine plumbing to provide an unyielding, high-volume union that will comfortably outlast your boat.

Unlike cheap brass fittings which suffer from rapid dezincification (leaching zinc in saltwater and turning brittle over time), this adapter is cast from pure C83600 marine bronze. It is fully immune to harsh saltwater galvanic corrosion and handles excessive engine vibration with ease.

What sets the Groco PTH series apart is its true full-flow internal geometry. The wall thickness is engineered to maximize internal diameter (ID), ensuring that your engine or raw-water washdown pump receives its optimal volume of fluid without restrictive pressure drops. The hose barb end is deliberately extended and deeply ridged, providing ample surface area to comfortably install dual marine-grade T-bolt or worm-gear hose clamps to guarantee a completely leak-free seal.

Key Features

• Premium C83600 Marine Bronze: Crafted from heavy-duty, corrosion-resistant cast bronze to safely handle below-the-waterline exposure without degrading.

• True Full-Flow Internal Design: Maximizes the internal fluid passage diameter to prevent system restrictions and pump cavitation.

• Extended Deep-Ridge Barb: Features an elongated barb profile with deep-set ridges, ensuring a tight grip and plenty of room for dual hose clamping.

• Precision NPT Machining: Features clean, sharp National Pipe Tapered (NPT) male threads to guarantee a perfectly watertight seal when threaded into female valves or strainers.

• Hex-Nut Base wrenching flat: Includes a cast-in hex shoulder, letting you apply perfect wrench torque during installation without damaging the threads or marring the barb.

Specifications