What are the types of metal hose couplings?
(1) Male connector: It is mainly used for the connection of the local junction box and the hose. Open the hole in the ground box, insert the joint, and fix it with the lock nut.
(2) Female threaded joint: mainly used for threaded connection of cable tube and hose.
(3) ferrule type joint: mainly used for the connection of metal hose and steel pipe. The ferrule joint installation does not need to be lapped on the steel pipe. The joint is at the end of the steel pipe, and one card is fast, which has the characteristics of convenient installation.
(4) Interposer type connector: It is mainly used for the small dense gap of the pre-embedded tube, and the inner diameter of the inserted steel pipe is convenient for installation.
(5) Reducing joint: It is mainly used for the case where the diameter of the steel pipe and the metal hose are inconsistent, and can be arbitrarily larger and smaller according to the site installation requirements. 
Editor in charge: Wang Zhen
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