Affix copperaluminium sealing ring assortments din 7603 affix 49 0126 this copperaluminium sealing ring assortment din 7603 is a 100 piece collection of six different sized rings and seals ranging from 8 x 14 to 18 x 24mm a superb assortment that comes supplied in a plastic case making it ideal for when using with pipework in hydraulic and pneumatic systems etc where the soft metal conforms to uneven surfaces to provide a good seal affix copperaluminium sealing ring assortment din 76