Concealed, quiet diaphragm-type rough brass flushometer valve. Complete with chloramine resistant, dual seal diaphragm with a clog resistant by-pass. The valve is ADA compliant with a non-hold open and no leak handle feature, high back pressure vacuum breaker, one-piece hex coupling nut, adjustable tailpiece and spud coupling for back spud connection. Control stop has internal siphon-guard protection. Internal seals are made of chloramine resistant materials.