Spare o-rings for Olympus underwater housings. It is vital to keep at least one spare o-ring in your camera bag because if the o-ring you are using breaks or is damaged you cannot use the housing as it creates the seal to keep water out.
Spare replacement o-ring for the Olympus PT041 underwater housing as used by the Olympus MJU 790SW digital camera. We always advise to keep a spare o-ring handy in case the one with your housing becomes cracked or is scratched and it requires replaci.....