Leadnoakum
32 Cal
When plumbers remove old cast iron hub and spigot pipe, the hubs have lead poured into them. I take a hammer and smash the hubs to get at it. It is soft lead that melts well. The oakum is easy to skim off the top when it melts.I get lead from my local scrap yard. Old style shower pans were pure lead as is x-ray room shielding. Way less expensive than Roto