Made in accordance with the applicable rules and low no. 46 of 5th March 1990 and Presidential Decree no. 1095 dated 3rd August 1968, it is an ESENCOR CU DHP 99,9% copper alloy pipe complying with European Standard EN 1057 -annealed in coils and phosphorous- deoxidised, with minimum 99,9% copper content and 0,015 - 0,040% phosphorous, in compliance with UN1 5649/71 series B, heavy, bearing the marking "ESENCOR D x thickness EN 1057 CU DHP 99,9% SLM I 00".

The inside surfaces are thoroughly cleaned and plugs are fitted at the ends to keep the pipe clean until it has been laid. Covered with a yellow polyvinyl chloride (PVC) sheath for easy identification on site. It is non-toxic, odourless and free from chlorofluorocarbons (CFC) and bears the progressive marking "00 ISOCLIMA PVC GAS OD X thickness UN1 Cig 7129 with ESENCOR copper pipe" as well as an indication of the date, time and production line for quality control purpose.