Coilhose Pneumatics BLSV06F06F Lockout Slide Valve, 3/8-Inch FPT In-Port, 3/8-Inch NPT Female Out-Port Accidental start-up is prevented by locking valve in "closed" position Valve accommodates lock shank up to .145" Trapped air is bled off to prevent unexpected cycling 3/8"FPT In Port x 3/8" MPT Out Port