1/2" Male Thread to 1" Male Thread adapter

Upgrade your boat's plumbing system with our robust 1/2" Male Pipe Thread to 1" Male Pipe Thread Adapter, precision-engineered from high-strength marine composite for superior resistance to corrosion, flexing, and environmental wear. Built to thrive in saltwater conditions and extreme climates, this marine-grade plumbing adapter offers long-term reliability where other fittings fail.

The tapered male pipe threads ensure a snug, leak-free seal across a wide range of marine fittings, including plastic, brass, and stainless steel components—making it perfect for bilge pumps, livewell systems, thru-hull connections, and other onboard applications. The hexagonal center design enables quick and secure tightening using standard tools, streamlining both replacement and new installs.

Measuring just 1.70 inches in length, this compact yet durable straight adapter is ideal for tight spaces and ensures a precise fit for your boat’s plumbing system. Whether you’re conducting routine maintenance or outfitting a new vessel, this USA-made adapter provides peace of mind and consistent performance.

Compatible with plumbing systems on boats by manufacturers such as Groco, Attwood, Perko, and Forespar, this is a versatile solution trusted by marine technicians and DIYers alike.

Choose American craftsmanship. Choose reliability. Upgrade today with our 1/2" MPT to 1" MPT marine composite adapter and enjoy leak-proof boating for years to come.

Product Specifications 

• Product Type: Straight Adapter – Male Pipe Thread (MPT) to Male Pipe Thread (MPT)

• Thread Size: 1/2" MPT × 1" MPT (tapered threads)

• Material: High-strength engineered marine composite

• Length: 1.70 inches overall

• Design Feature: Hex-shaped center for secure grip

• Compatibility: Fits plastic, brass, and stainless steel plumbing components

• Origin: Proudly made in the USA