Uniweld RB2 Patriot series acetylene regulator has an "A" outlet connection and a 520 CGA (Compressed Gas Association) inlet. Patriot series regulators feature protective rubber gauge boots, rear inlet service and specially compounded diaphragm and seat material that provide accuracy and reliability. The regulator provides a delivery pressure of 2-15 psi. It comes with a 30 psi delivery gauge and a 400 psi contents gauge that shows full, 3/4, 1/2 and 1/4. Replacement delivery gauge is Part # G15D. Replacement contents gauge is Part # G19D.