This category contains LegendPressCSG Reducer Couplings.The LegendPressCSG Carbon Steel Gas Press Reducing Couplings allow you to change sizes between two steel gas pipes with CSG Press configuration. Each CSG end fitting has an HNBR O-ring designed to provide the heat and temperature resistance required in gas applications. They are certified to ANSI LC 4a / CSA 6.32: Press-Connect Metallic Fittings for Use in Fuel Gas Distribution Systems and ASTM F3226. They are commonly used on Schedules 10 & 40 black steel pipe (ASTM A53).