... /2,7×81/2Cementing PlugFrequently-used Specification:Conventional cementing plug: 133/8 ,103/4,95/8, ... bottom plugs are only supplied with two-stage cementing tools.The drill pipe plugs and hollow plugs ... used in drilling liner cementing are only available with drilling liner hangers.Butterfly ... Dg150),8(Dg200),10 (Dg250),12(Dg300)Stage-cementing EquipmentSpecification:5,5 1/2,7,9 5/ ...