UMO1625 Multi Pack of United Moulders Gas Seal Washer.
The UMO1625 Multi Pack is available in a pack of 10 or a pack of 100. It can also be bought individually on this link.
This washer is for 1/2″ thread Compact Mini Manual Inflators.
IU-UMO1625-02 is the full UML Serial number for this item.
It is fitted 1 per device inside the threaded area of the inflator head. Anyone checking and fitting this part should have good technical knowledge of the product. This is typically a trade part used by lifejacket service stations and larger commercial users who have internal servicing.
This washer helps guard against the cylinder coming loose. After tightening, the seal creates a reverse pressure against the thread. Cylinders should be checked regularly to make sure they are screwed tight.
More information can be found on the manufacturer website.