Rigid casing pipe for jacking and drilling ROS-Zk (RHDPE) 160/9.1- red -12m. Casing pipes for jacking and drilling ROS-Zk (RHDPEp) are smooth-walled pipes intended for directional drilling, joined by welding. As a standard, they are made in sections of 6 and 12 meters, in the colors: red and blue on the outside, black on the inside.