FTI Air Model FT15Z air operated double diaphragm pumps features a unique stall free air valve that is simple, rugged and reliable and requires no separate pilot valve or a mechanically operated pilot valve. Bolted construction provides leak-free fluid handling. Pumps are available with polypropylene or PVDF wetted materials. Diaphragms, balls and seats are available in a wide range of materials to provide reliable operation in a wide variety of applications. FTI Air products have fewer parts, simpler design and are less prone to failure.