I am asking for some advice from the drillers and others with flush carts on this forum. Here is my problem: 8 year old single pump (26-99) double-O Ring type pressurized flow center The composite 3-way valves have not been turned in those 8 years, and now seem to be stuck. I've tried to turn them with a 8" 3/8" drive breaker bar, but I was afraid to apply too much force and break something. Do I try to rock them back and forth, etc. or is it time for a new flow center? I'm going to await until spring in any case to try again. Am I just looking for trouble and should just leave it alone? Thanks!