Rolair 131B2 Pilot Unloader Valve is an OEM replacement part for Rolair gas-powered compressors, compatible with models 5715K17DC, 6820K17DC, and 5520K17DC. The dual-control pilot unloader features a 1/4" tube discharge connection and a 1/4" male NPT pilot thread, designed for Rolair systems that use standard 1/4" lines. It is intended for constant-run applications and is rated for operating pressures of 105-125 psi. As part of the pressure-switch/pilot-unloader assembly, this valve helps unload head pressure when the unit stops, enabling smoother restarts and reduced cycling.
