Easily cover rubber electrical splices with Duck Brand Rubber Splice Tape. This traditional self-fusing 30-mil rubber tape provides a watertight cover for electrical splices. Protect your electrical wiring work from costly moisture damage. This black tape comes in a 3/4-inch by 22 foot roll. If you’re tackling a DIY project at home, Duck Brand has many useful DIY products that will help you get the job done.