131BIG can be used on both the electric and gasoline air compressors. The pilot unloader valve is pre-set to load at 110psi and unload at 135psi. This valve will blow off pressure at the top end setpoint and is designed to be used with air compressors that do not have built in head unloaders. 131BIG is the same pilot valve as 131B, but with larger discharge port for constant speed applications.
A separate 1/4" port is included for tying in your unloader line. This valve is able to be used with compressors that displace 20cfm or below.
For use with RolAir Models: