Sold individually (two are pictured to show top and bottom views). This plastic cap fits the family of large brake fluid reservoirs from AP Racing / Lockheed (2.6" / 66mm and 2.85" / 73mm body OD) including our Part Nos. 3565 and 3566. 3 1/2" OD, 3 1/8" thread diameter. This cap is designed to use a gasket (included) and will not work with a moisture barrier diaphragm without modification. Does not fit any other brand.
Fits AP Racing reservoirs CP2293-141 (offset 7/16-20 thread), CP4342-372 (single push-on outlet), CP4342-355 (dual push-on outlet), and CP4623-8 (offset M12 thread). Can also be used on CP2293-69, CP2293-85, CP2293-143, and CP4623-7 versions by either removing the moisture barrier from the reservoir or removing the gasket and retainer from the cap.