Metric bulkhead hydraulic connector BB M18x1.5 12L with locknut (XSV) Waryński. Metric bulkhead hydraulic connector BB M18x1.5 12L with locknut (XSV) Waryński. 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.