"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, Max. PSI 300, Pieces qty. 2, Style V, Swivels No, Male or Female F, Material Type Steel. Specifically designed for use with HVLP spray guns & equipment Maximum inlet pressure 300 PSI Maximum temperature 250F Air Flow 74 SCFM @ 100 PSI"