Arse. Dont believe it!...got three of the valves from the ebay link a few posts above this, after getting thread measurements from the seller. Unfortunately, with us both being out by a millimeter or two the bloomin thing is too big!!...it goes into the hole until you get to the thread, which is a mm or so wider than the rest of the valve, but the threads are too big!....also, the plunger bit that opens to allow the air in only slightly smaller than the thread!!
I was wondering, as it seems that I am not going to be able to get the correct valves for this boat, I am wondering if I got the valves I now own re-threaded so that they fit the male thread on my boat, and drill out the "lip" that you can see in the pictures of my valve, at the end of the male thread, so that the plunger can go in and out when the new valve is screwed in?...anyone tried such a thing? cheers for now.
Oh, and I wont be able to take the male part of the original valve out of my boat and replace it with my new male valve, as they seem to have been fitted from the inside, and have quite a wide solid area around them, which is obviously glued to the inside of the tube! Below is a pic of my new thread, taken from the net: