Milton V-Style Hi-Flo Plug is steel-plated to prevent rust and designed to reduce the risk of possible injury or damage due to accidental air line disconnect. Double clicks to ensure proper connection: First click locks coupler and plug; second click engages air pressure. When disconnecting, first click will relieve air pressure; second click allows coupler and plug to be safely disengaged. Coupler Size (in.): 1/4, Pieces (qty.): 2, Swivels: No, Male or Female: M, Max. PSI: 300, Material Type: Steel, Style: V