Mates with all industry standard commercial air start nipples. 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 seperate locking positions. Extra heavy duty handle resists bending. Semi-circle handle can be indexed for clearance in all aircraft panels. Handle designed for access to recessed aircraft nipples. Field tested with positive results.