These hose adapters are made from Forespar's high-strength, glass-reinforced, composite polymer, Marelon®.
With abrasion and UV resistance comparable to bronze, and over 3/4 of the strength, Marelon's added 100% corrosion resistance makes it a "no brainer" choice for thru-hulls, valves, and other plumbing fittings. Among plastic fittings, Marelon is more than twice as strong as nylon, its next closest rival.
• Hose size refers to barbed end
• Threaded end is a tapered NPT pipe thread