This 1 inch-11-1/2 W-Series Wingstyle Female NPTF Coupler from Dixon is designed for applications like dump trailer wet-line hydraulic systems and oil field equipment. It features stainless steel springs and retaining rings, a rugged steel wing nut, and a nitrile rubber seal. Also, it includes a full hex for ease of installation and an anti-extrusion Seal-Pack for longevity.