Black Swan's Jumbo Flange & Gasket is a 100% pure wax gasket for setting all floor outlet toilet bowls. This ring contains 40% more wax than the regular Black Swan Flange & Gasket. Ideal to use where the regular ring does not provide enough wax to make a good seal. The gasket forms a water tight, gas tight and odor tight seal. Fits 3" and 4" waste lines. Meets Federal Specification TT-P-1536A. This ring has a plastic flange which extends the discharge opening. This makes for a more positive seal and assures proper bowl alignment. For certain locations throughout the United States local codes require the plastic flange to fit 4" openings only. Black Swan does have this product available (Stock No. 4600).