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pdlouche-
Received yesterday - I'll get a photo up later when home from work.
It's essentially made up of 2 parts; a small screw-on adapter that screws directly onto the valve core and a J-bend valve which then screws onto the adapter. So once you have screwed on both parts, there's no way it'll come loose...unless you strip the threads.
Looks neat and I'll give it a go later
pifko
The hole in my -insert obscure unknown Russian- disc is too small to get the normal pump head in and I had to get a screw-on 90 degree adapter for the valve. Problem is the pressure just makes the pump head blow off the adapter. It's a bit rubbish.