Attwood White Plastic Thru-Hull Fitting - 3/4" Inner Diameter

The Attwood White Plastic Thru-Hull Fitting – 3/4" Inner Diameter is an essential through-hull component for any serious boater or angler who demands reliable water intake and drainage systems. Whether you're running a cooling system, bilge pump, or live-well circulation on a fishing vessel, this fitting serves as the critical interface between your boat's internal plumbing and the water outside. Built by Attwood Marine, a trusted name in marine hardware, this thru-hull fitting is engineered to handle years of saltwater and freshwater exposure without compromise.

Constructed from durable thermoplastic material, this fitting actively prevents electrolysis—a silent killer that can rapidly corrode metal fittings and degrade bonding systems on fiberglass hulls. The 3/4" inner diameter hose connection accommodates standard marine hose sizing and is compatible with common through-hull applications including engine cooling loops, transom drains, and raw-water systems. Thermoplastic construction also resists UV degradation and chemical breakdown from fuel, oil, and saltwater exposure, extending service life well beyond standard plastic alternatives found in budget hardware.

Anglers and offshore boaters will appreciate the white finish, which remains visible for routine maintenance checks and integrates cleanly into most transom and hull installations. Installation is straightforward on new builds or retrofit applications—simply secure the fitting through the hull and connect marine-grade hose with stainless steel clamps to prevent galvanic corrosion. This fitting is ideal for both salt and fresh water operations, making it equally at home on a Gulf Coast redfish boat or a Great Lakes walleye rig. For anyone upgrading aging through-hull systems or building a reliable boat plumbing foundation, this Attwood fitting delivers proven marine-grade dependability.