Important: Some housings have double O'ring system, so in case you got 2 O'rings installed on your housing - it is important to know which one to change. These spare O'rings are only for the back of the housing( transparent side ). The O'ring on port side of housing doesn't need to be changed, just keep it clean.
Below are the camera models that use the O'Ring size 155 x 3.5mm.
Sony: A7 and A7II
Olympus: E-M5
Fujifilm: X-A1, X-A2, X-M1
- Barcode: 29001
- Supplier Code: Meikon-Oring-155