2007 pt 425 hydraulic oil filter oem; Parker #921999 10c, specifications, 1''-12tpi unf threads 20gpm flow rate 10 micron filtration 150psi max. pressure 225degree max. temp. 15psi relief valve setting alternative filter found locally was WIX 51551 and/or NAPA 1551 , I would recommend cutting open your OEM filter and checking for a relief valve and keep in mind this is a ''suction filter''? if anyone could clarify the difference between a hydraulic suction line filter and a hydraulic pressure line filter please by all means educate me I have cut open both types and could not discern any difference in manufacture internally