Pneumatic Quick-Disconnect Lockout, f/1/4, 3/8, 1/2 in M, Zenoy Thermoplast., RDIsolate pneumatic energy without the expense and inconvenience of installing in-line lockout valvesDevice is applied to the male fitting, isolating equipment from all compressed air sourcesAccommodates the majority of 1/4 in, 3/8 in and 1/2 in male fittingsHole in center