Rubber Fab on Twitter: "Not 100% certain what size O-Ring you have? Stop guessing and take a look at Rubber Fab's O-Ring measurement cone! This ideal tool was made for quick and
O-Ring Sizing Tools - YouTube
Parker O Ring Sizing Cone MPN:887-300 | eBay
ZMSC31947021 - Value Collection - O-Rings Sizing Cone - O Ring Sizing Cone