Aro R21-C4-000-29 Dial-Air Regulator 1/2 Inch BSP – 94553799

These regulators feature a transparent pressure-calibrated, nonrising adjustment dial which allows one to dial any secondary pressure. If a gauge is required for monitoring reasons, two 1/4″ gauge ports are provided: however, these are usually used for additional outlet port. In less than 270 degree turn, the full secondary pressure range can be dialed. This feature is particularly advantageous if secondary pressure must be changed frequently.