Drilling Machines cut or drill through the pipe wall of cast iron, ductile iron, C900 PVC and PE water mains via the corporation stop inserted into the service saddle while under pressure. They use Reed D series drill bits or hole cutters. The DM2100B drilling machine consists of the base unit, which allows the customer to purchase separately individual corporation adapters, drill or hole cutter adapters, along with necessary drills or hole cutters. With shell cutters and necessary adapters, these units can also be used on C900 PVC pipe. DM2100110 drilling machine is for use with Mueller® 110 compression corporation stops. DM2100CCNPT is a combination of 3/4” and 1” AWWA CC thread and 1 1/2” and 2” NPT thread adapters. DM2100UNIVERSAL drilling machine has the base and accessories to work for AWWA and NPT threads up to 2”.