330 series mechanical lifting valves have high reliability in terms of robustness and high air flow rate. Versions with unidirectional rollers, bidirectional rollers and feelers are available in 2/2, 3/2 and 5/2 modes with connections ranging from 1/8" to 1/2" with either zamak body (version 1/8" and 1/4") or aluminum aluminum (version 1/2"). Secure by locking ring nut and hole in valve body.