Have you got the (Halkey) valve in the open or closed position? Leave it open, centre pin pushed in and twisted clockwise. The close, push down and twist centre pin to left for final high pressure pump up.
Valve should be open to get majority of chambers full of air, then closed to top up
Do not inflate one tube to high pressure with the others empty, baffle will pop or risk of. Inflate one by one to a similar pressure
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