The Natural Philosopher wrote in message ...

Compression, but beware that they are weak at the normal pipe diameter.
PTFE tape doesn't work well - use Red Loctite to seal. Try to avoid up
and under routing - you will just have to bleed it - don't put bleed
valves on, just steel yourself and suck the bloody pipe full and then
never ever let it run dry again

Plstic bag loosely over end of pipe before sucking would make life
less unpleasant - but I can just imagine some incompetent person
breathing the bag up and choking. So I'd best say dont.

Regards, NT