Perko 1" Thru-Hull Fitting w/Pipe Thread Bronze MADE IN THE USA

The Perko 1" Thru-Hull Fitting w/Pipe Thread Bronze is the marine hardware standard that serious boaters and anglers have trusted for decades. Built for through-hull applications where reliability below the waterline is non-negotiable, this cast bronze fitting serves as the critical interface between your vessel's hull and through-hull plumbing systems—whether for raw water cooling, drain lines, or intake manifolds. Made in the USA, this fitting delivers the corrosion resistance and structural integrity that saltwater and freshwater environments demand.

Machined from solid cast bronze, the Perko fitting combines exceptional durability with precision engineering. The flange is machined to mate flush with your hull and features a grooved design that retains bedding compound—eliminating weeping and maintaining a watertight seal even under vibration and thermal cycling. The neck is threaded to approximately 3/8 inch from the flange, accommodating standard pipe threads and allowing secure connection of your through-hull plumbing without requiring a separate coupling. Bronze construction naturally resists galvanic corrosion better than cheaper alternatives, protecting both the fitting and surrounding hull materials from deterioration over years of service.

This 1-inch fitting is ideal for both new builds and replacements on cruising sailboats, center consoles, and cabin cruisers where through-hull systems must perform without maintenance or failure. Professional boat builders and experienced anglers specify Perko fittings because the cost savings from using inferior alternatives pale against the risk of a mid-ocean or mid-lake failure. Installation is straightforward for those comfortable working below the waterline—proper bedding with marine sealant and stainless fasteners ensures longevity. Compatible with standard 1-inch pipe threads and sized at 3 x 3 x 4 inches, this fitting integrates seamlessly into existing marine plumbing layouts on vessels of all types.