Series 911 combination fill valve and backflow preventer consists of a Model 9D backflow preventer and Model 1156F feed water pressure regulator in one pre-assembled unit.

• 系列911组合进水阀和防倒流阀，由型号9D防倒流阀和型号1156F供水压力调节阀组成，预组装在一个装置内。