Re-fitting Zodiac plunge type valves

[Max...]

I bought a couple of these spare and thought I would take the old ones out just to check the spares I bought were the correct fitting - they were - but on re-fitting the old ones and inflating to full pressure the air rushes out when the pump is removed, fiddling around with the valve stem sorts it but on re-pumping the same again.

These are the new ones below, they are slightly different with a small flexible nylon disc held with a screw as the seal, the older ones have a rubber disc with a spike that sits loose in the valve.

ZODIAC BOMBARD Boat Plunger replacement AIR valve body | eBay UK

Anyone had this before or know any trick, I have checked and double checked the valve and rubber is sitting right, the valve insert is fully screwed in, the stem is 'out' etc.

[Dino89]

contact barnet marine and ask the question they are very helpful

[Max...]

Rollocks to it - had them in and out, and out and in, put the new ones in now and will keep the old as spare.