Fx air bottle help

new to forum . 
I do pest control in Australia and recently added a another pcp to my list of guns. 
It is fx impact . I wanted to add a spare air bottle for nights when I have to shoot over the amount in one tank.
I can find carbon fibre bottles with no valve , can these no valve bottles be used to do what I want 
thanks in advance
 
http://www.bestfittings.co.uk/shopexd.asp?id=731&bc=no
This is the valve you need. There is a post on AGN somewhere Ernest explains you do need to trim a tiny bit off the bipod rail. There was a run on the valves after Ernest explained they can be use so out of stock at the moment. . The bottles are 500cc as opposed to 480cc stock bottle so more shots. 
I'll have another look for tread when I get time. 
Michael
 
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