Reinforced with urethane and sporting a sleeve, this Plumb Craft wax ring creates a flexible seal between the toilet and outlet and shifts with toilet or building movement, while the sleeve increase protection against leaks and foul odors. Fits 3" and 4" flange and suits cast iron, DWV Copper, Plastic ABS and PVC Pipe. To extend the life of your toilet, do not use in-tank toilet bowl cleaners, as they can damage in-tank components. Plumb Craft's complete line of high-quality home plumbing repair and replacement products come with easy-to-understand, step-by-step instructions.