Affix copperaluminium sealing ring assortments din 7603 affix 49 0151 this copperaluminium sealing ring assortment din 7603 is a 316 piece collection of eight different sized rings and seals ranging from 8 x 12 to 22 x 27mm 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