Henco supplies a full range of multilayer pipe PEXc-Al-PEXc gas pipes and matching PVDF plastic press fittings. Henco is available in diameters 16 to 40 mm. HENCO is the only supplier which has received Gaskeur approval for plastic fittings and these are available in all required types. The design of these press fittings is the same as the PVDF fittings for water applications. The dedicated Henco gas fittings are marked in yellow - these are the only fittings to be used for gas, and they should not be used for other applications. The wide choice in fittings such as male and female threaded adaptors as well as compression adaptors means you can easily make connections to existing copper piping. The full Henco gas range has Kiwa-Gastec approval. These certificates can be downloads from the Henco website, www.HENCO.be . For installation instructions you are referred to NPR 3378-5 and 3378-6 of October 2007.