Explain: This series collects all kinds of connection forms and structural couplings, nipples, nozzles, rotary couplings, thermowells and other products in the automatic control instrument pipeline system. It is an essential connecting piece in the pipeline with a wide range of varieties, specifications and applications. The YZG9 series of rubber pipe joints are mostly used for sampling or temporary needs, but not for formal automatic control systems. It has two types: end welding and end thread connection. The end thread has two types: metric and inch, and the other end is connected with rubber hose.