Metric bulkhead hydraulic coupling BB M22x1.5 15L with locknut (XSV) Waryński. Metric bulkhead hydraulic coupling BB M22x1.5 15L 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.