Perko 1-1/4" Thru-Hull Fitting w/Pipe Thread Bronze MADE IN THE USA

The Perko 1-1/4" Thru-Hull Fitting w/Pipe Thread Bronze is a marine-grade through-hull valve body engineered for seawater intake, cooling systems, and live well applications aboard fishing boats and cruising vessels. Cast from solid bronze, this fitting serves as the primary penetration point where raw water enters the hull—a critical component that demands corrosion resistance and long-term reliability in saltwater environments. Whether you're upgrading an older system or replacing a corroded fitting on your center console, this American-made piece represents the standard that professional captains and serious boaters have trusted for decades.

This fitting features a 1-1/4 inch pipe thread connection and is precision-machined with a grooved flange designed to lock bedding compound in place, ensuring a permanent watertight seal against the hull. The neck is threaded to within approximately 3/8 inch from the flange, allowing plenty of engagement for internal plumbing while the generous flange diameter distributes load evenly across the hull surface. Bronze construction provides inherent corrosion immunity—no anodizing to fail, no galvanic concerns when paired with dissimilar metals. The grooved design eliminates the guesswork of bedding compound application; compound stays where you put it, creating a seal that outlasts the boat itself.

Installers and boat builders specify Perko thru-hull fittings for raw water systems, engine cooling intakes, and transom-mounted through-hulls where pump suction or cooling flow demands reliability under continuous operation. The 1-1/4 inch size handles moderate flow rates typical of gasoline engine cooling loops and auxiliary systems on boats up to 40 feet. Installation requires hull drilling, bedding compound application, and secure fastening from inside the hull—a straightforward procedure that yields decades of leak-free service. This fitting is a genuine replacement component for existing Perko systems and a proven choice for new builds seeking proven American marine hardware.