This category contains LegendPressCSG Couplings with and without stop. LegendPressCSG Carbon Steel Gas Press Couplings connect gas steel pipe on both ends with a CSG Press connection. 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).