Connection Kit Pbl-1/4-Db-Mini for Service Units In the Db-Mini Series. Corrosion Resistance Classification Crc=1 - Low Corrosion Stress, Materials Note=Free of Copper and Ptfe, Material of Connecting Plate=Zinc Die-Casting, Material Seals=Nbr, Material Nut=(* Steel, * Galvanised), Festo