... deep holes. High seal reliability. Brief Introductions of Casing Pipe It is used for protecting subsurface formations. It ... . YUKUN have years of experience in producing quality casing pipes, any of your requirements will be warlmly welcomed. ... reduced by the inner flat design. Available size for Casing Pipe "W" Design: RW,EW,AW,BW,NW ... ,EX,AX,BX,NX,HX,PX,SX,UX,ZX Casing tube Specification: O. D 2 3/8, 3 ...