1. Whether it is a square tube or a rectangular tube, it should be supplied by the supplier. Square and rectangular tubes of different grades and materials should not be connected together.
2. When the square pipe is connected to accessories such as threaded valves, water nozzles, water meters, etc., the thread must not be put on the square pipe, but the transition should be made through wire accessories such as conversion joints.
3. When buried connection is required, note that the square pipe should not be connected with If cement, cement mortar and concrete are in direct contact, plastic-coated wall welded pipes or anti-corrosion glue should be used to maintain the outer walls of the pipes.
4. When connecting square pipes, be careful to avoid sharp objects hitting the square pipes. When using seals to connect, be careful to avoid oil or other dirt from contaminating the seals.

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