This is the Steel helium escape valve 086ST0115
These are Omega supplied service HE valves fitted to some model Seamaster Planet Ocean watches.
Omega 086ST0115 Seamaster Planet Ocean Helium Escape Valve Steel
Items can only be returned if either faulty, in the case of the item not being required then it must be returned exactly as received. For example if the item is new in a sealed packet and/or has protective covers in place then it must be returned the same otherwise item is no longer new and the value is greatly reduced, these items can only be returned/refunded by agreeing a lower value with Swiss Limited Editions before returning reflecting the new lower value of the item.