Oatey Company 30374 1.7 Oz #95 Flux Formulated with the same high quality as no 5 however, patented OATEY Silver solder powder is added to pre-tin the Copper pipe Flux can never burn out 100% lead free Formulated with the same high quality as No. 5. However, patented Oatey silver solder powder is added to pre-tin the copper pipe Flux can never burn out 100% lead free Excellent for large diameter copper Does not turn copper green