Andrew Gabriel wrote:

not just natural gas. I used it alot when installing
my radiator pipework, by pressurising the pipework
using a bicycle pump, so I could fix any leaks
before making the pipework wet.

I need to do some of this shortly and have collected together a small
collection of pushfit fittings and adaptors etc to do it with... but how
do you attach the bike pump to the pipework? Haven't come across a
Schraeder valve - pushfit fitting yet!!

David