This EH series is interchangeable with PARKER H SERIES, PARKER IH SERIES, SNAP-TITE H SERIES, SNAP-TITE IH SERIES, DIXON V SERIES, FASTER TNV SERIES, FASTER TNL SERIES, DNP PNVX SERIES, DNP PNOX SERIES and STUCCHI SH SERIES. Stainless Steel Product. 103 series couplings are commonly used in US market as an alternative to standard series. Their valves have been designed to help flow and to allow connection with 104 parts (free flow) same series. AISI SS316 Material.