SMC Air Regulator AR20-B - AR40-B SMC’s new AR-B series pneumatic regulators with a pressure range setting of 0.05 to 0.7 MPa or 0.02 to 0.2 MPa. The modular design of these pneumatic regulators allows connection to other SMC air preparation equipment and the AR-B series can be mounted using a bracket or panel mounted. All versions come with a locking setting nut to prevent accidental adjustment and available in body sizes from size 20 to 40 and 1/8” to 1/2" piping.