Inner tubes slide into place and seal with double o-rings as the threaded outer tubes are torqued together. This saves valuable time and protects personnel as well as the connection from handling damage associated with the old connector tube systems. 

Abrasion-resistant alloy steel inner and outer tubes extend life of the drill pipe. 

IMRC is made to order in sizes and lengths specified by each customer. We have made 4 ½" and 9 5/8" OD strings but are willing to design and build anything in between (or smaller). Just call with your inquiry.