Model 3510 is a heavy-duty high flow manifold regulator equipped with inlet and outlet connections required on Harris manifold systems. The body ports are 1/2 in. NPT for direct mounting in piping systems. The 3510 features both 1/4 in. NPT high-pressure and 1/4 in. NPT low-pressure ports. It features a brass body, bonnet, T-screw bar handle, 2.5 in. brass dual scale gauges and a neoprene diaphragm. Model 3510 is equipped with a tamper-proof, self-reseating, high-pressure internal safety relief valve. This model is not for use with high pressure cylinder gases, such as CGAs 996(RH) and 997(LH),