PRESSURE SWITCH/STEEL/4PSI 76577-00000040-01PRESSURE SWITCH/STEEL/4PSINormally ClosedOpen at 4 psi1/8 " pipe thread2 TerminalUsed on systems that need pressure in system of 4 psi before starting, or on most systems that need lubrication pressure before power up.Product CodesMfr Part No:76577-0000004..