Weld-On Flowguard Gold Yellow: Medium bodied, fast setting, low VOC CPVC cement for copper tube size pipe and fittings with interference fit through 2 in. (63 mm) diameter. ONE STEP CEMENT formulated to be used without primer if Codes permit. For potable water to 180F (82C). Suitable for residential plumbing and industrial systems. Approved by Lubrizol Advanced Materials, Inc. for FlowGuard Gold Systems.