This EH series is interchangeable with CEJN 116 SERIES, VOSWINKEL HD SERIES, FASTER UHP 150 SERIES, DNP PCJ6 SERIES, and PARKER HP SERIES. Steel Product. Representing EH's most advanced hydraulic coupling technology, the 156 series is engineered for extreme-pressure applications exceeding 150 MPa. These couplings combine unparalleled reliability with robust construction, featuring redundant safety systems that incorporate both visual indicators and mechanical interlocks. Designed for mission-critical operations, the 156 series delivers exceptional performance where standard hydraulic connections would fail, making it the premier solution for ultra-high-pressure systems demanding absolute operational security and durability.