If that installed duct can be in the externalscrew fixed outlet.
如明装风管，则可在管外用螺丝固定风口。
2
The utility model comprises a jar body, a jar lid, an air hole, a cushion ring, internal screw threads and externalscrew threads.
本实用新型由坛体、坛盖、透气孔、垫圈、内螺纹和外螺纹构成。
3
The intramedullary nail is mainly characterized by including a solid nail body, the upper section of which is an externalscrew thread rod and a copulate fixedly pressure-adding screw cap;