Designed to protect the oil pump and cam plate from debris off the chain-tensioners or other particles that may come loose in a Twin Cam engineGreat to put in when doing a cam bearing jobKeeps cam bearing rollers from dropping into the center section of your engine, which could ruin the oil pump and cam plateDoes not restrict oil flow - in testing the engine returned the same amount of oil back to the oil tank in an allotted amount of time the screens de-aerate the oil more, which drops oil temperature 5-10°FEasy-to-install and cleanMade in the USAFor use with OEM oil pumps only.