This category contains LegendPressCSG Caps. LegendPressCSG Carbon Steel Gas Press caps allows you to quickly end a stub out or cap a gas line. Each CSG end fitting comes with an HNBR O-ring which is designed to provide the heat and temperature resistance required in gas applications.These caps 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).