Description For Use With Weatherproof Boxes, Extension Adapters, Cluster Covers And Round Splice Boxes To Seal Off Unused Outlets. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov