Changed out filters this spring, and commented to parts man at Cobe Marine, my authorized Westerbeke dealer, why there is’nt a cross for the 30548, $25 is alot for a small filter. He has tried for a long time to cross, but has not been able to find ones that match exactly. One would think after all this time somebody can make it less expensive. Found a few on ebay for cheap, snagged em up.