Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, chokeplug, inside the wire, outside the wire, turned-over edge, increaser etc.
管件类： 弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。
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By several decades of exploration and practice, the designer has profound acquaintance with stressing mechanism of chokeplug that does not rely on shear force to maintain the balance.