... 1, 168,219,273,323,407mm in diamater. 2, angle, ball joint and inlet flange is optional 3, selection of gear ratios A ... duty design, large torqe and low noise.B) outside tube complete with one inlet, one outlet, end flange, ball joint , inspection window ... couplingD) Lifting eyes on each tube section, convinient for transport and installtion.E) small diameter, great efficiency, high throughout rates ...