Oil filter. Uses: Mercury MerCruiser GM, Mercury MerCruiser GM V-8 Engines, Crusader Engines, Chris Craft Motors (283,305,307,350,454) OMC GM Engines (replacement for: 502901 and 502902) mainly for filters on external consoles, Pleasurecraft (PCM) GM engines (replacement for R077002), Volvo Penta (replacement for 835440-9). Except V-6 models that have the oil filter mounted on the engine block.