... directional water tap,182X182X4.5M driving drill pipe and 168×8×3M assistant drill pipe, IS150 clean water pump realize directional circulation ... circulation drilling with air-water used tap, double-wall drilling pipe, gas-water separator; can carry out Hydraulic DTH hammer ... 10×6050 Reverse main drill pipe (mm)182×182×4500 Reverse assistant drill pipe (mm) (mm)D168×8×3000 multi-function drilling rig