O-Ring for aluminum nuts (formerly OR-212)

O-Ring for aluminum nuts (formerly OR-212)EPDM O-Ring used with all Sterilight aluminum retaining nut #'s RN-001 & RN-SUV and most Sterilight quartz sleeves. This replaces O-Ring # OR-212 which was discontinued in 2008 for the better sealing O-Ring # 410867.