Metric bulkhead hydraulic coupling BB M26x1.5 18L with locknut (XSV) Waryńśki [W-5011771818]Metric bulkhead hydraulic coupling BB M26x1.5 18L with locknut (XSV) Waryńśki. The fasteners were designed and manufactured in accordance with applicable standards, which describe in detail the quality and dimensional requirements. They are compatible with fasteners from other renowned power hydraulics manufacturers.