... -key encryption,one card with one code.3,One card for different meter or one card for one meter.4,Valve will shut down ... .0000599,999 DIMENSIONS TypeSizeLLengthL1 LengthB WidthH HeightdConnecting ThreadDN15152591657899G3/4BDN20202991957899G1BDN25253452258399G11/4B IC card prepayment intelligent water meter for resident area