a) Nipple With Drillable Pack off BushingModel No.: CT-NDPBProduct No.: CT93503 b) Nipple With Drillable Pack off Bushing (DPB®) With Flapper Valve Model No.: CT-NDPB-FProduct No.: CT93504 The Flapper Valve Assembly DPB® (Drillable Pack-off Bushing) provides a method of sealing off the liner top to allow for cementing. It is generally run directly below the liner top […]