Was a bit of a pain to add a 15mm coupling to the bottom of the drinker as there isn't much room to make the connection tight. We have Lola's water piped in from an IBC to the bottom of the drinker and added pipe up above it with a tap to allow us to give it a clean every now and then as the bowl gets dirty from her nose. The quality of the build is really good though and the flow rate is good enough you don't need to have it plumbed into a pump.