Up for sale is KPMI 2005-2006 FLSTFSE CVO Softail Fat Boy Harley Davidson COMPRESSION RELEASE 2/PK TWIN CAMS. The vendor part number is 20-21255. Please read the title to know what is for sale KPMI� Compression release valves are state of the art Designed to reduce �hot start� issues and starter/battery loads 5-7 Newton�s of closing force resistance, for high demand applications Custom molded knobs ensure a cool touch and easy operation Embossed with the KPMI� brand so you know you have purchased a quality product M10 x 1 thread pitch, sold in pairs