The 5 lb. Lead Wool is used to seal hubbed cast iron pipe fittings. Lead wool is used in lieu of molten lead. Highlights: Sold by the 5 lbs box Primarily used with hubbed cast iron pipe fittings Easier to use instead of molten lead Creates seal when used with oakum Used For Packing Cast Iron Hubbed Joints A form of caulking lead, is long fine strands of chemical grade lead which is twisted into 5/8"rope for use in various applications It averages about 2 1/2 ft. to one pound Be certified to meet Federal Specification QQ-C-40 CALIFORNIA PROPOSITION 65 ⚠️ WARNING: This product contains lead, a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.