GROCO Bronze Hose Barb Thru-Hull Fitting - 2"

The GROCO Bronze Hose Barb Thru-Hull Fitting in 2-inch size is a marine-grade through-hull connector engineered for seawater applications where corrosion resistance and reliability are non-negotiable. Cast from C83600 bronze—a high-strength copper alloy specifically formulated for saltwater immersion—this fitting handles the demands of coastal boating, offshore fishing platforms, and permanent water intake or discharge systems on vessels of all sizes. The barbed hose connection design creates a secure mechanical grip that resists pressure cycling common in engine cooling loops, raw water systems, and bilge applications.

The 2-inch National Pipe Straight (NPS) thread provides a standard marine connection point compatible with most through-hull installations. C83600 bronze maintains its integrity in saltwater environments where ferrous metals corrode rapidly, ensuring long service life without pitting or dezincification. UL Listed under standard 647B certification confirms this fitting meets established marine safety and material standards for potable water and engine cooling systems. The barbed design eliminates reliance on hose clamps alone, distributing stress evenly across the connection and preventing hose blowoff under load—a critical safety feature on high-pressure engine cooling systems or through-hull seawater intakes subject to vibration and thermal cycling.

This fitting suits anglers and boaters maintaining diesel or gasoline engines, raw water cooling systems, and through-hull discharge lines where both corrosion protection and mechanical reliability matter. Weekend cruisers running freshwater systems and serious offshore operators relying on engine integrity in remote conditions both depend on fittings that hold pressure without weeping or failing. The 2-inch size accommodates high-flow applications typical of large cabin cruisers, commercial fishing vessels, and rescue boats where adequate cooling water circulation determines engine longevity.

Bronze through-hull fittings represent the marine industry standard for permanent seawater-contact applications. Unlike stainless steel fittings that can exhibit stress-corrosion cracking in chloride-rich saltwater, bronze C83600 alloys are proven across decades of offshore use. Proper installation requires bedding the fitting with marine sealant and backing nuts to prevent galvanic action at the hull interface—standard practice among experienced boat builders and system technicians.