forget the pcb they are crap,just wire up to an exterior
switch b&q a fiver. then fit a hoselock tap controller on
end of backpack hose.
if this doesnt turn water down enough for you before pressure
switch cuts in make a return from pole hose connector using
y piece you can get packs of them from b&q to the shoulder of the
backpack.
get spare battery from screwfix or other as one battery will drain quicker
and jobs a good un.
i have better control over mine now than when i was using
the pcb
