Just updated my old GE water softener because of age, leaking seal around top and buttons starting to get hard to make functions work. Bought this one because of the exact plumbing measurements of the older unit. Made installiation about a half hour project. Replaced the two included inlet and outlet threaded fittings to fit the new bypass valve.Old unit was 15+ years old and has worked great all its life until a few issues with the setting buttons and leaking upper seal recently. First GE was a replacement for an overpriced name brand softener that had to be constantly worked on. The rectangle shape takes up less room that the older round model.