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Clapet check valve, with rubber seat seal. Compatible with water for heating systems, domestic water, glycol water (max. 30% glycol). ISO 228 female threaded connections. UNI EN 12165 CW617N (3/8”÷1”) brass valve body; brass UNI EN 1982 CB753S (1 1/4”÷4”). UNI EN 12165 CW617N brass cap. O-ring and gasket in NBR. UNI EN 12165 CW617N brass knocker. Temperature range: 5÷95 °C (110 °C for occasional peaks). Maximum working pressure: 10 bar (4”). Opening pressure: 0.05 bar.