GROCO Bronze Pipe Nipple - 3" NPT

The GROCO Bronze Pipe Nipple - 3" NPT is a heavy-duty plumbing and industrial fitting designed for applications requiring reliable fluid or gas transfer in marine, agricultural, and commercial systems. This NPT-threaded connector bridges two female ports with a compact, full-flow design that eliminates unnecessary pressure drop across the connection point. Built by GROCO, a trusted manufacturer of bronze marine hardware, this nipple serves professionals and technicians who demand corrosion-resistant fittings capable of withstanding saltwater, fresh water, and mixed-media environments.

Manufactured from C83600 bronze—a high-strength copper alloy prized for its durability and resistance to dezincification—the GROCO nipple provides superior longevity compared to standard brass fittings in corrosive conditions. The cast-in wrench flat on both ends simplifies installation, removal, and future maintenance by allowing controlled torque application without marring the fitting surface. The full-flow internal geometry ensures minimal turbulence and maximum flow rate, critical for gravity-fed systems, pressurized lines, and applications where efficiency directly impacts performance. NPT (National Pipe Thread) connections on both ends deliver a tapered, self-sealing design when paired with compatible thread sealant, eliminating the need for separate gaskets.

This 3-inch fitting is ideal for marine propulsion systems, saltwater cooling circuits, agricultural irrigation headers, and industrial process piping where bronze offers superior corrosion resistance over steel or iron. Installation requires standard pipe wrenches or the integrated flats for controlled turning; apply PTFE thread tape or pipe dope to NPT threads before assembly to ensure leak-free operation. The 2.45-pound weight reflects the substantial bronze construction, ensuring this nipple withstands high-cycle vibration and thermal cycling without degradation. Compatible with all standard NPT-threaded fittings, valves, and manifolds, making it a versatile replacement or upgrade component for existing systems.