if you go to the previuos mentioned suppliers you should be able to get both the male & fmale parts you want to make up a test kit.
if you really want to you can then make up a nice block with all the bits in a circle as per the one desplayed in the standard alternatively we just have them in a foam lined box in little cutouts labelled with the corrrect gas type.
Dont forget to test the pressure / leak as well as the indexing.
You ca also get heat shrink with the correct colour and name of gas written on it. Makes the job look a bit tidier.
