The Watts 994HMB fire hydrant backflow preventer meter meets or exceeds registration accuracy for the low flow rate, normal operating flow rate, and maximum continuous operation flow rate as specifically stated in AWWA Standard C701.

• 美国瓦茨994HMB消防栓防回流阀仪表满足或优于美国自来水厂协会（AWWA）C701标准规定的最小流量、正常工作流量和最大持续工作流量的记录精度。