The height of the waterproof ring should be less than the height (thickness) of the edge of the crystal. How to choose the size of waterproof ring?. The following is for reference only, it is best to follow the original actual use [Select reference].
0.6mm 0.9mm Watch Gasket Back Cover I-Ring 16-42mm Water-proof O-ring Case Rings
Rear Cover Gasket Sealing Ring Repair Tools Parts. The height of the waterproof ring should be less than the height (thickness) of the edge of the crystal.