Hammar M1A1 Operating Head (2027 expiry!)
This replacement operating head will fit all automatic jackets that use the hammar M1A1 (hydrostatic) automatic inflator. (Sometimes mis-spelt as Hammer.)
The kit includes a replacement Hammar hydrostatic head, this part is used for replacing date expired operating heads. See video for fitting instructions.
These parts have a sell by / use by date - ours are guaranteed to be the freshest stock available in the UK. If you are unsure which rearming kit your lifejacket accepts please email us before ordering!






















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