Spare o-rings for Fantasea 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 o-ring which is compatible with Fantasea CP3, CP3N, CP4 Sport and Pro, CP5, CP6, CP7, FP1, FP4, FL3, FL4 and FL6 housings. It is essential to have a spare o-ring in your kit bag.