a good starting point if your making your own would be the fire extinguisher, connector pipe, it will have a female thread on the nut keep the nut and some pipe for starters, I think you have to use the cylinder upside down? - sorry if I`m wrong.
If you havent got the pipe, any local fire extinguisher service Est will help you out.
Stan
i just want to adapt my male inlet regulator to the fire extinguishers male outlet,it should be perfectly secure
thinkin abuwt it i think this wud be better?
http://www.ebay.co.uk/itm/HYDRAULIC...aultDomain_3&hash=item3a57e7e42a#ht_500wt_759