螺旋管件的英文：
screwed fittings

fittings是什么意思：
adj. 适合的；适当的；相称的
n. 装置；设备；试衣

This cap fits you better.
这顶帽子对你更合适。

To join by or fit into a gain.
在腰槽内连接或配合

This car is fitted with radial tyres.
这辆车配有子午线轮胎。

She was fit to scream.
她几乎要尖叫起来。

make (animals) fit for cultivation.
使（动物）适应耕作。