GROCO Bronze Hose Barb Thru-Hull Fitting - 5/8"

The GROCO Bronze Hose Barb Thru-Hull Fitting in 5/8" size is a corrosion-resistant through-hull connection engineered for reliable marine plumbing installations. Cast from C83600 bronze—a marine-grade alloy proven to withstand prolonged saltwater exposure—this fitting combines durable construction with the dependable barb-to-hose interface that offshore anglers and boat owners depend on for bilge, raw water, and drainage systems.

The 5/8" bore accommodates standard marine hose sizes while the NPT (National Pipe Thread) connection ensures compatibility with through-hull mounting and deck hardware. UL Listed under Standard 647B, this fitting meets safety and material standards for marine water system applications. The hose barb design creates a mechanical lock with hose material, reducing dependency on hose clamps alone and providing redundant security—critical when hull penetrations are involved. Bronze construction resists galvanic corrosion better than ferrous alternatives, making it suitable for saltwater environments where corrosion failure can lead to catastrophic hull breaches.

This fitting serves weekend fishermen running portable livewell systems, cruisers with integrated cooling loops, and serious offshore vessels with redundant bilge configurations. Whether you're replacing a failed through-hull connection or upgrading raw-water intake plumbing, the bronze construction and UL 647B certification provide the reliability required when engine cooling or hull integrity depends on the connection. Replacement and upgrade work demands proven materials—bronze thru-hulls are standard in marine repair for good reason.