These 12mm (1/2") Tefen fittings are ideal for connecting plastic, rubber and soft PVC, silicone hoses, particularly in industrial and domestic applications. The fitting size is determined by the inside diameter (ID) of the hose. They are highly durable, with a working pressure of 14 bar (200 psi) at 20°C, and a temperature range from -20°C to 110°C (-5°F to 230°F). They are made from Nylon 66 and require a hose clip or snap clip for assembly. These fittings are also chemically compatible with diesel fuel, hydraulic oils, methanol, petroleum, and sodium hydroxide.