GROCO Stainless Steel Hose Barb Thru-Hull Fitting - 1-1/4"

The GROCO Stainless Steel Hose Barb Thru-Hull Fitting in 1-1/4" size is a marine-grade through-hull connector engineered for reliable fluid transfer in demanding saltwater and freshwater environments. Built from #316 stainless steel—the marine industry standard for corrosion resistance—this thru-hull fitting delivers the durability and longevity that serious boaters and commercial operators require when seawater exposure is constant.

This GROCO fitting features an NPS (National Pipe Straight) threaded connection paired with a hose barb design, allowing secure attachment to hose without additional clamps in many applications. The 1-1/4" diameter accommodates substantial flow rates for cooling systems, bilge pumps, raw water intake lines, and engine exhaust cooling loops. UL Listed to standard 647B, the fitting meets established safety certifications for marine electrical and fluid systems. The stainless steel construction resists the corrosive action of saltwater far more effectively than mild steel or brass alternatives, preventing leaching and maintaining structural integrity over years of service.

Weekend cruisers, commercial fishing vessels, and offshore yachts rely on thru-hull fittings like this for water supply, engine cooling, and waste management systems. This 1-1/4" model is sized for mid-range flow requirements—larger than typical galley or head plumbing but smaller than main engine raw-water circuits. The threaded connection ensures a watertight seal when properly installed in a through-hull port, while the hose barb provides a positive mechanical lock for hose attachment, reducing the risk of disconnection due to vibration or pressure surge.