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NEN-EN 4420-8:2013+A1 specifies dimensions, types of connections, quality of materials, marking re-quirements and testing requirements for hose fittings with symmetrical half couplings (Guillemin sys-tem), with mobile locking ring, for hose assemblies with a maximum working pressure of up to 10 bar1) with hose tails according to EN 14420-2 and clamp units according to EN 14420-3. Couplings in accord-ance with this document serve as link between hoses and connections to transport liquids, solids (e.g. powders, granules) except steam and liquid gas. The working temperature range is -20 °C up to +65 °C.