Hercules Pro Dope Pipe Joint Compound is an oil-based, soft-setting thread sealant with a uniform, smooth consistency that ensures an easy, drip-free application. This versatile sealant can be used in pipe systems carrying water, natural gas (except oxygen), air, steam, ammonia, brine, diluted acids and alkalis. Both non-hardening and non-toxic, Pro Dope is FBC-approved for use with BlazeMaster, Corzan and FlowGuard CPVC piping systems and can also be used with certain PVC piping (confirm compatibility with manufacturer). This low-odor pipe joint compound wipes away with ease, and its gray color blends in with metal piping for improved aesthetics. Behold the power of Hercules, products built to last and trusted by plumbers to withstand even the toughest conditions.