11
Pipes for carrying liquids for heating, cooling, and water installations; Pipes for underfloor heating installations; Pipes including an oxygen barrier (parts of a sanitary, heating or cooling installation); Pipes without an oxygen barrier (parts of a sanitary, heating or cooling installation); Multilayered pipes using pex or pert or polybutylene or hdpm as one of the layers (parts of a sanitary, heating or cooling installation); Pipes comprising at least 3 layers (parts of a sanitary, heating or cooling installation)
17
Flexible pipes and tubes, not of metal; Flexible pipes and tubes for\ carrying liquids including for heating, cooling, and water installations; Flexible pipes and tubes for underfloor heating installations; Flexible\ pipes and tubes including an oxygen barrier; Flexible pipes and tubes\ without an oxygen barrier; Flexible pipes and tubes comprising at\ least 3 layers; Multi-layered flexible pipes and tubes using Pex plastic\ as one of the layers