(1) The cutting should use metal saw cutting;

(2) Special groove rolling machine should be used for groove pressing;

(3) The pipe bender should be cold-bent by a pipe bender;

(4) The pipe thread should be processed by the electric pipe threader;

(5) The burrs and rounded corners of plastic-coated steel pipe ports should be processed with files;

(6) A small bristle brush or a small toothbrush should be used to apply high-strength inorganic solvent liquid epoxy resin coating.