Size: 1/4 Body with 3/8 SAE Thread. This 1/4 coupler connects to its male equivalent. Features: Heavy Duty Design with 7350 PSI Rating. Max Flow Rate: 6.34 GPM. Locking sleeve helps prevent accidental disconnects. Compact profile with high flow performance. Harden steel construction with anti-corrosive plating. Sleeves are hardened to resist deformation and maximize life of the coupler. Valve design that allows for a minimal pressure drops and one hand operation. Seals are rated for operating temperatures up to 250°F. Female Face Diameter: 1.10 (28mm). Hex: .87 (30mm).