The corresponding products are used in the decompression series of higher systems at pressures and low to moderate flows. This regulator has a diaphragm to provide great sensitivity for high pressure relief. PTFE stainless steel seating assembly provides good turn-off in most. For economic purposes, the cap assembly and knobs are of aluminum construction, the same matching unit as the PR-50. The good sensitivity and wide selection control range make this regulator excellent for selection in many research and test plant facilities.