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Measuring solution for volume flow determination acc. Testo-Ident No.: 0699.7077/1. Consisting of flow matrix, telescope (0430 0946) with flexible head, length 1.8 m, with 2 x 2 m rubber hose with Velcro fastening at the telescope. Connection option to e.g. t-420, t-480, t-435, t-512.