Gasket seals inside DWV pipe. Strong, adjustable stainless steel swivel ring means you adjust the ring, not the flange. No chance of breaking gasket seal. Engineered elastomer gasket is chemical and heat-resistant. Larger flow-through area than similar gasketed closet flanges. Push-Tite installation kit includes: Model No. 887-GPTM, wax ring, closet bolts, and shims.