i had this problem when this machine started to work the w24 wheel cuter even though i ve change this seal about ten times.and i have also tryed the original part three orings about 25 euros or35 dollars ithink ,a week ago the valve ofthe high flow on top of the pump stoped working not from the solinoid but from her mechanical part.i replaced her with new ok she works know i have high flow again but i didnt solve my problem with the oring even thought ive change it with a new valve.any advice!!!