The SMC AR-D series of modular pressure regulators are designed for use with AC20-D series of FRLs. This regulator comes without a backflow function, and it has G type pipe threads. The port size of this regulator is 1/8 in and it has a round type pressure gauge (with limit indicator). Set pressure for this regulator is 0.02 to 0.2 MPa
Models with the backflow function include a mechanism which allows for the air pressure in the outlet side to be released to the inlet side