ive had a few tems off john hewitt replacement pumps for
my crap shurflo backpack and use a couple of his ws15
backpacks i have found far more reliable than the shurflo
and with only one speed im not spending out evry six months for
pcbs.
the only problem ive had with them is that the switch disintergrates
after a few months,easy to replace though with conections
having spade ends,just went into halfords and spent a couple
of quid on a couple of replacements and no problems since
i find the speed ideal most of the time with the flow coming
out a little over 2ltrs per min but i have a hoselock connector
with a tap on it on the backpack hose which gives me plenty of
control over the flow which i need sometimes at the start of the day
as the battery has a full charge.