I've been installing a lot of bottle filler water coolers here on base lately, and I installed another two today. The first one on base was at the gym and now everyone wants them... These aren't too difficult to install, and would be easiest in new installation, but we are always just replacing old coolers with this style. So, the existing drains and water supplies tend to be a nightmare if not positioned just right. The main reason for this is there's just no room inside these things, and to add to the space issues, a huge filter attaches inside. I hate to say, but I think I've had to make and alteration here and there to every one of them to get these hooked up correctly!