So having fitted my gasit refillable earlier in the week I've just been to get my first fill. I think that the 80% cut off valve didn't work (I have read -albeit on the gaslow instructions - that this sometimes happens) and ended up just manually stopping. I also had a leak from the joint where the filler hose joins the cylinder. Unfortunately I couldn't tell that this was leaking until I looked in the locker after filling. I have returned home and disconnected this fitting and refitted. Unfortunately I won't be able to tell if this is fixed until next time I fill. The problem I have is that I am now nervous about refilling again in case the 80% shut off valve doesn't activate, and on the next fill I'll have no idea how much was in the cylinder to start off with. Has anyone else had this issue? Of course there is also the possibility that the cylinder did shut off but the gas didn't because it still had somewhere to go because of the slight leak.