... Single phase,4 terminal,2 or 3 wire,Fix hub size:1/2",3/4",1" SYR-100A Series Round ... terminalscircuit of applicationapplicable meter form designationMeter class ratingFix hub sizestds packspacking sizeSYR-100A4 2W/3W,1Phase 1S/ ... /240V AC,Single phase,4 terminals,2 or 3 wire Copper Jaw,Copper or aluminum connector•The ... a serrated surface.Stainless steel sealing ringFix hub size:1/2,3/4,1, meter socket