Flanged face-to-face dimensions are equal to most commonly used lined steel diaphragm valves. Body and bonnet materials are solid thermoplastic. Only body and diaphragm are wetted parts. Bubble-tight closure, even in slurry applications. Large weir surface allows greater flows with less movement of diaphragm. Position indicator and adjustable travel stop to prevent over tightening. Other sizes larger than 4" are available.