This EH series is interchangeable with STUCCHI VD SERIES, FASTER CVV SERIES, VOSWINKEL HS SERIES, DNP PVV3 SERIES, DIXON CVV SERIES, and GROMELLE 626-A SERIES. Steel Product. General-purpose screw-on couplings designed for reliable performance under residual pressure conditions. Engineered to withstand high-pressure impulses and flow surges while maintaining ISO 14541 interchangeability.