You can buy direct from fuelock - http://www.fuelock.co.uk/
The product is nice, just what I thought was appropriate. Only thing is that my filler is 1.5" diameter across threads, 1.5" BSP is actually 1.88" so it did not fit *#*^#*!!! Next time I can get to a chandlery I want to measure up filler caps and see what is common. Is mine unusual or is this just a difference between the yachty market and the narrowboat market? Any one know?
The guy at fuelock is a boater albeit of the yachty kind, pleasant to deal with, has a no guibble refund policy. He has told me that he may make them in another size if there is demand but is having a few problems working out what the narrowboat market uses. I don't blame him, I am equally confused but then Croydon is a bit shy on chandleries ...
If the common size is 1.88" then I will look at changing my deck filler as I like the fuelock product. If not then Fuelock simply say send it back to them for a full refund
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Richard
http://indigodream.wordpress.com/