Oatey No. 95 Tinning Flux is a petrolatum-based flux containing tinning powder to help pre-tin the pipe. It cleans, tins and fluxes most commonly soldered metals. 100 percent lead-free, No. 95 Tinning Flux is NSF-listed for potable water applications. Its formula prevents copper piping turning green and is excellent for large diameter copper pipe applications. Oatey products have earned the trust of plumbing professionals for over 100 years.