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Graco 181251 is a replacement bare regulator with a maximum flow of 200 scfm (5.6 m³/min) and 3/8 inlet/outlet ports with a 1/4 gauge port. It features a knob handle, a 0-75 psi (0-0.5 MPA, 0-5 bar) regulated pressure range, and a Nitrile Rubber diaphragm. Suitable for Senator and Bulldog pump/system applications.