Changed the spin-on transmission filter on one of our front end loaders. Typically use Fleetguard products, HF35140 in this case, but was out of them so I called Napa and they crossed that over to a Wix 57723 that they had in stock so I went and picked it up. Installed on a Friday evening and drove the loader out of the shop and parked it but didn't use the loader again until Monday morning, first bucket full of the first load, the o-ring on the filter blew out and dumped 7 gallons of transmission fluid on the ground. Fortunately, had picked up some new Fleetguards that morning, installed one and had no more problems the rest of the day. I believe the filter sees main pressure which is about 235-250 psi.