Groco Brass & Bronze Pipe & Hose Fittings

Groco Brass & Bronze Pipe & Hose Fittings: Marine-Grade Connections Built to Last

When it comes to dependable plumbing connections aboard a vessel, few names carry the weight of Groco. Founded in 1918, Groco has spent over a century engineering marine hardware that performs under the relentless demands of saltwater, pressure, and vibration. Their brass and bronze pipe and hose fittings represent one of the most focused expressions of that legacy — precision-cast components designed specifically for the marine environment where a failed fitting is never just an inconvenience.

What Sets Groco Bronze Fittings Apart

Groco's brass and bronze pipe and hose fittings are manufactured from C83600 and C84400 marine-grade bronze alloys, chosen for their exceptional strength and corrosion resistance in raw water and bilge applications. These are not generic plumbing fittings repurposed for the marine market — they are purpose-built for connecting seacocks, raw water strainers, and other through-hull systems that demand a secure, leak-resistant seal.

Groco's pipe-to-hose adapter lineup spans a broad range of configurations to suit virtually any marine plumbing run. Straight fittings (PTH Series) offer a direct male NPT-to-hose barb connection, while the 90-degree elbow PTH-C Series and 45-degree PTHD Series give installers the routing flexibility needed in tight engine rooms and below-waterline compartments. For applications where water flow volume is paramount, Groco also offers a Full Flow series (FFC Series) that provides a larger internal bore compared to standard flow fittings, reducing back-pressure in high-demand raw water circuits. Sizes run from 1/2" up to 5" in the standard flow range, and 1/2" to 3" in the full flow range, covering everything from small auxiliary systems to large main engine cooling lines.

Bronze pipe nipples in the PN Series round out the lineup. A standout detail here is the cast-in wrench flat on Groco's nipples, which simplifies installation and removal in confined spaces — a small design touch that reflects Groco's long-standing philosophy of pairing quality materials with thoughtful engineering. All relevant fittings carry UL Listed 647B certification, providing an additional layer of quality assurance that matters to professional boat builders and rigorous DIY restorers alike.

The Right Fitting for the Right Job

Groco bronze fittings are engineered for use with seacocks, raw water strainers, and components featuring tapered female pipe threading. It is worth noting that C83600 and C84400 bronze fittings are not NSF-61 compliant and are therefore intended for raw water and non-potable marine systems — exactly the applications where their corrosion resistance and structural integrity shine. Whether you are connecting a Groco seacock to a cooling hose or routing raw water to an engine strainer, these fittings deliver the confidence of over 100 years of American marine manufacturing behind every threaded joint.