Groco THXL1500WS 1-1/2" Extra Long Stainless Steel Thru-Hull Fitting

Groco

<h3>A Century of Marine Engineering Excellence</h3><p><strong>GROCO</strong> — short for Gross Mechanical Laboratories, Inc. — is one of the most storied names in American marine manufacturing. <a href="/7373-groco">Founded in 1918</a> in Baltimore, Maryland, the company was built from the ground up by Angus Roy Gross Sr., an inventor whose restless curiosity drove him to patent everything from a carbonating faucet to an automobile tail light. That same spirit of relentless improvement has defined GROCO for more than a century.</p><p>Today, GROCO is an established third-generation U.S. manufacturer widely regarded for superior construction and cutting-edge features. The company is now headquartered in Stevensville, Maryland, and remains committed to domestic production — a point of pride in an era of widespread overseas manufacturing. Founded on the principles of innovative design and sound construction, their goal is to be the choice of those who demand quality products a cut above the rest.</p><h3>What GROCO Makes</h3><p>GROCO specializes in high-quality bronze and stainless steel marine hardware, including seacocks and valves, marine strainers, various pumping solutions, and secure pipe and hose fittings. Every product in their lineup is engineered to function reliably in harsh saltwater environments — the kind of reliability that boat builders, marine surveyors, and offshore sailors have come to depend on for generations.</p><p>At the heart of GROCO's reputation are their seacocks and valves. GROCO valves and seacocks are engineered for longevity and performance, using solid bronze rather than DZR materials to ensure durability in demanding marine environments. The lineup spans flanged seacocks, inline ball valves, check valves, fuel valves, and the innovative E-Valve electric valve system. The GROCO E-Valve system allows boaters to remotely control and monitor valves through onboard NMEA 2000 networks — a standout example of the brand weaving modern technology into traditional marine hardware.</p><p>What sets GROCO seacocks apart from the competition are the practical engineering details. A standout feature of GROCO seacocks is the integrated grease zerk fitting, allowing onboard greasing without dismantling the valve — a significant advantage when access is limited. Each valve also includes a patented handle design that lets users choose the direction of handle rotation, and a square port designed to accept a ratchet, making operation easier when manual access is restricted.</p><h3>Innovation That Keeps Evolving</h3><p>GROCO hasn't rested on a century of goodwill. As raw water strainers do their job, filter baskets become clogged with debris — so GROCO developed HYDROMATIC strainers that eliminate untimely shut-downs by conducting a periodic self-cleaning cycle using a powerful internal macerator. Their SSA Raw Water Monitoring System adds another layer of protection, alerting the vessel operator visually and audibly to significant reductions in raw water flow — faster than traditional gauges or sensors — fast enough to prevent damage before it occurs.</p><p>From corrosion-resistant 316 stainless steel fittings to weldable aluminum hull scoops for aluminum-hulled vessels, GROCO has been manufacturing quality underwater hardware including valves, fittings, pumps, and other marine parts for over 100 years. Whether you're commissioning a new vessel or upgrading aging through-hull hardware, GROCO's catalog offers a trusted solution for virtually every onboard plumbing need.</p>