Precise expansion processing is at one side end of copper pipe on DHF, DHS series. (excerpt for some)
Copper pipe hardness is 1/2H for better handling.
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◆About Japan MLIT specification conforming products
Insulation has double thickness 20mm with higher adhesion than standard type.
Suitable under high temperature and humidity construction environment where the insulation 10mm thickness could not cover. Insulation effect of keeping warm and cold is significantly better.
Precise expansion processing is at one side end of copper pipe.