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This Graco 234389 air pressure regulator includes a gauge and is self-relieving, with a knob handle for adjustment. It features a 1/4 in. npt(m) inlet and 1/4 in. npt(f) outlet, supporting a maximum inlet pressure of 160 psi (1.1 MPa, 11 bar) and a regulated pressure range of 0-160 psi. Maximum flow rate is 22 CFM at 50 psi (.34 MPa, 3.4 bar).