Milton 3/8" NPT High Pressure Regulator - 1114-8. 3/8" NPT High Pressure Regulator offers a stable downstream air pressure over a wide range of air flows with accurate control, fast response time and minimal pressure drop. Offset gauge ports can also serve as two 1/4" supply lines. The aluminum die cast body comes with a balanced piston and molded rubber seat. As a high pressure regulator, the 3/8" NPT High Pressure has a maximum inlet pressure of 250 PSI and a regulated pressure range of 10-250 PSI.