Took up toilet and re installed and rebuilt insides of tank after Pages Flooring took up old flooring and installed this beautiful flooring.
This is the reason . It is a valve that opens and shuts as needed when you push buttons on front of frig.
Beware some cartridges are harder than others to change. Especially when they break off in the wall. That’s why you need this. Kim Glascock Plumbing 937-477-3744