Parallex2, the vid gives you the basic idea but now I think Imeo has come round to filling the AVS off the GGTS using side of palm to block the bottom hole. This has big advantages and when you screw it all up tight the excess liquid is not forced into the collection tank so when you have a 100% sealed AVS and put it back on you are good to go straight away, no pulling it back off to empty the CT.