... ,7,51/2,5Top plug and bottom plug used in two-stage cementing: 13 3/8 ,10 3/4,9 5/8 ... /2,5The top/middle/bottom plugs are only supplied with two-stage cementing tools.The drill pipe plugs and hollow plugs used ... ,5 (Dg125),6 (Dg150),8(Dg200),10 (Dg250),12(Dg300)Stage-cementing EquipmentSpecification:5,5 1/2,7,9 5/8 ...