Air Start Straight Coupler with check valve and stainless steel screens. Features zinc-plated hardware for extreme weather durability. Mates with all industry standard commercial air start nipples. 3.5-inch outer diameter hose flange. Rugged design and easy maintenance and overhaul. Positive “Lock” and “Unlock” positions. A colored ring identifier visually assures that the coupling is in the locked position. Three separate locking positions. Extra heavy duty handle resists bending. Semi