... deep holes. High seal reliability. Brief Introductions of Casing Pipe It is used for protecting subsurface formations. It also ... of your requirements will be warlmly welcomed.Features of Casing Pipe 1) Use optimized buttress thread so that the ... 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 ...