Hitachi 881575 is a four-port pressure switch with an integrated unloader and an on-off lever, rated for 95–125 PSI. The unloader helps vent residual pressure for smoother cycling, while the on-off lever provides manual control to start and stop operation. This Hitachi component is identified by the 881575 part number and is designed for applications requiring a four-port pressure-switch solution in the 95–125 PSI range.
