4x O-rings for a Aeris dive computer, Seal (Battery not included) Kit for Aeris Atmos 1,2,AI,XR1 & XR2. This user-replaceable O-ring for Battery Kit for Aeris Atmos 1,2,AI,XR1 & XR2. Aeris Atmos, 1, 2, Ai Elite, XR2.
eBay