Kolk flexible pipe joints are made of steel with flange drilling according to EN 1092-2 (ISO 7005-2). Epoxy coating (Resicoat®) according to EN 14901 (DIN 30,677-2) and GSK certified (RAL-GZ 662). When ordering, specify the length and the quality of the bolts and nuts (stainless steel A2 / A4, hot dip or galvanized). The length (L) is determined by the required movement (X). The values shown in the table are for L = 1 m.