Malone Specialty Inc. offers Carbon Steel Non-Return Valves as well as 316 Stainless Steel Non-Return Valves, in various configurations including, but not limited to: Tube to BSPP Port – Flow to Port End, Tube to BSPP Port – Flow to Tube End, Tube to Metric Port – Flow to Port End, Tube to Metric Port – Flow to Tube End, and Tube to Tube. These Non-Return Valves, or Check Valves, comply with the DIN 3859-1 specifications. For more information see below, or contact one of our experienced salesmen at 440-255-4200.