Groco Bronze Thru-Hull Fitting with Hose Barb - Available in 5/8" to 1-1/2"

The Groco Bronze Thru-Hull Fitting with Hose Barb is the marine industry standard for creating a permanent, sealed hose connection through a boat's hull below or above the waterline. Cast from solid bronze for long-term resistance to saltwater and freshwater corrosion, each fitting combines a flanged mushroom head on the outside of the hull with a threaded hose barb shank on the inside, secured by a bronze locknut for a watertight, high-pressure seal. These fittings are used throughout the boat for bilge pump discharge, washdown intake, raw water intake and discharge, livewell plumbing, and other through-hull hose runs where reliability cannot be compromised.

Every Groco thru-hull fitting is precision cast and machined to hold up under continuous submersion and vibration, with a heavy nominal wall thickness that resists cracking, pitting, and dezincification far longer than plastic or low-grade alloy alternatives. Whether you are replacing a corroded fitting or plumbing a new through-hull run, this line covers the common hose sizes found on recreational and light commercial vessels.

Specifications

• Brand: Groco
• Material: Solid bronze construction
• Style: Mushroom-head thru-hull with hose barb and mounting nut
• Maximum pressure rating: 2000 PSI
• Available hose sizes: 5/8 Inch and 1-1/2 Inch
• Corrosion resistant for saltwater and freshwater service

Sizes & Options

This thru-hull fitting is sold by hose barb size, and matching the size to your existing hose run is critical for a leak-free installation. Measure the inside diameter (ID) of the hose you are connecting to and choose the fitting whose barb matches that ID exactly - a barb that is too small or too large will not seal properly even with hose clamps. The 5/8 Inch (HTH-625) fitting suits smaller washdown, livewell, and drain lines, while the 1-1/2 Inch (HTH-1500) fitting is sized for larger bilge pump discharge and raw water lines. If you are replacing an existing thru-hull, match the hose size of the fitting being removed rather than the hole diameter alone.