The Delta Commercial offering goes beyond providing exceptional Commercial-grade performance with products that reflect the personality of the individual institution. Delta believes there is a better way to live with water and has developed smart solutions that meet the unique requirements presented by each Commercial environment. Providing individuals with a better way to experience water, while standing up to prolonged, rigorous use. And, all Delta Commercial products are backed by the industry's best 5-year limited warranty. For 1-1/2 in. Wall Hung Back Inlet Closet Fixture 16mm (5/8 in.) dia. push button Quiet action, TECK concealed diaphragm flush valve Chloramine resistant diaphragm Flush Valve Push Button - Concealed