and this is where i normaly come for advise
i have just finished installing a front airlocker and compressor,
following the wiring diagram ect.
when turning the comprssor on i hear a hissing noise (air escaping the compressor) its coming from the screw in filter/nut on the end of the solinoid (follow the arrow in the pic)

when locker is activated, the hissing stops.
is this normal or is there something wrong??
steve