I bought this without reading the product compatibility section. Basically, this is for WIDE NECK bottles / something that you can get your hand in. I didn't see this (my mistake) and just assumed that I could attach to the end of my Ballihoo pressure cask. Can't get my hand in, so was a bit disappointed. To cut a long story short, I used a short section (approx 8 inches) of garden hose to connect the long plastic tube on the 'little bottler' to the stop tap on the pressure cask. The garden hose is rigid enough to exert an upwards force with the bottle to flow. I now have a pressure cask with detachable little bottler - don't forget to sterilise everything!