Pingel PE-62169 Oil Pump Screen Magnetic for Twin Cam 99-17The Twin Cam Oil Pump Screens were designed for OEM oil pumps. The screens protect the oil pump and cam plate from debris off the chain tensioners or other particles that may come loose in a twin cam engine. They are great to put in when doing a cam bearing job. You dont always know when you remove the cams if the inner cam bearings are intact. Sometimes one little roller may drop into the center section of your engine. This roller may be sucked up