... ~240VAC, Single phase,4 terminal,2 or 3 wire,Fix hub size:1/2",3/4",1" SYR-100A Series Round meter ... "-1” 40 75X39X43CMSYL-100A4 2W/3W,1Phase 1S/2S 100 3/4"-1” 40 75X39X43CM•100Amps,120/240V AC,Single phase ... ,4 terminals,2 or 3 wire Copper Jaw,Copper or aluminum connector•The Die-cast ... serrated surface.Stainless steel sealing ringFix hub size:1/2,3/4,1, meter socket