This EH series is interchangeable with DNP PVG1 SERIES, GROMELLE W6000 SERIES, INTEVA TGW SERIES, VOSWINKEL HB SERIES, EATON W6000 SERIES, and STAUFF HB SERIES. Steel Product. High-pressure screw-on couplings engineered for extreme working conditions with frequent pressure spikes. The heavy-duty internal construction ensures optimal safety and reliability. Market Interchange.