VT4 O-Rings

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Try on ebay. A person under the name of Battastic specializes in selling Orings for dive computers. He does sell the one for the Atom 3, which is 1.2mmx27.5mm. Good luck.
 
I found a relatively cheap source for these, but minimum order of 100 and a big price break at 250:

1.2X27.5 BUNA-N ORING 1.2X27.5 FKM ORING
Tolerance: ±0.07 X ±0.32 Tolerance: ±0.07 X ±0.32
70A BLK 75A BLK
QTY $/EA QTY $/EA
100 $1.21 100 $1.21
250 $0.52 250 $0.65
500 $0.28 500 $0.51
1,000 $0.19 1,000 $0.41

I would be inclined to go with viton because of the longer shelf life, but I'm hardly an expert on o-rings. Can also be ordered in 90 instead of 70/75.

If you're interested in going in on an order, please email me at: oceanic.atom.geo.orings@gmail.com

best,
jim
 
https://www.shearwater.com/products/swift/

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