GROCO 2" Bronze NPS to NPT Flange Adapter

The GROCO 2" Bronze NPS to NPT Flange Adapter is an essential marine plumbing fitting designed to bridge connection standards on vessel systems where thread compatibility matters. This adapter allows you to connect 2-inch NPS (National Pipe Straight) components to NPT (National Pipe Tapered) threaded ports, eliminating the need for costly system modifications or workarounds. Marine professionals and boat builders rely on GROCO adapters to maintain reliable, code-compliant plumbing installations in demanding saltwater and freshwater environments.

Constructed from bronze, this flange adapter provides exceptional corrosion resistance in marine applications where standard steel fittings fail prematurely. The 2-inch bore accommodates substantial flow rates typical of through-hull fittings, bilge systems, and raw-water cooling lines. The flange design creates a secure, leak-proof seal when properly bolted to bulkheads or manifolds, distributing pressure evenly and reducing stress concentrations at the connection point. Bronze's inherent strength and compatibility with diverse piping materials make it the material of choice for long-term reliability on vessels operating in harsh conditions.

This adapter serves boat owners, marine technicians, and system integrators who need to consolidate mixed-thread inventory or retrofit older vessels with modern components. Installation requires standard bolting procedures and basic plumbing knowledge; the compact 6 x 5 x 6-inch footprint fits into tight engine compartments and bilge spaces. Verify your existing NPS port dimensions and NPT fitting thread count before ordering to ensure proper fit and seal performance in your specific marine application.