Model 647 is a heavy duty panel mount pipeline regulator for accurate and repeatable delivery pressures. This model features a brass body, neoprene diaphragm, large plastic easily adjustable knob (shipped loose for making final maximum psi adjustments) and one-piece encapsulated seat designed with internal filter and neoprene seat. It has a 1/4 in. NPT (F) inlet connection. A panel mount nut is included. (Other pressure ranges are available that can be further customized to specific lower pressures.)