Airlock? / Cannot fill water through fill pipe.

[The Artfull Bodger]

Not much use of it is why, it's generally slated by plumbers but for this purpose it's really quite strong. Have a read of my build log and you'll see it all - it's called project Smurf. FYI on the EV2s, the key it comes with to tighten the compression is crap, bends very easily and if it slips off you will scratch your tube... be careful as you go

Thanks and will check that out