If the inside and outside are fully coated with plastic, no anti-corrosion oiling is required; if the inside is coated with plastic and the outside of the pipe is only insulated, no anti-corrosion oiling is needed; if the inside is coated with plastic and the outside of the pipe is directly exposed to the outside, anti-corrosion oiling is needed.
The disadvantage is that it must not be bent during installation. During hot processing and electric welding and cutting, the cut surface should be coated with non-toxic room-temperature curing glue provided by the manufacturer to repair the damaged parts.

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