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• Single, front threshold with integrated seat; 3.5" drain opening pre-drilled. • Integral tile flange. • Durable Lucite® cast acrylic shell is extremely scratch- and stain-resistant, yet renewable because the color goes all the way through the material. • Non-porous surface makes cleaning and sanitizing faster and more effective. • Multi-layered backing of thick fiberglass / resin / titanium encloses wood reinforcement to prevent flexing of floor pan. • At least 30% thicker and stronger than other makes. • Textured bottom that meets ASTM F-462-1994 certification requirements for safer showering. • NAHB Certified. • 10-year Limited Residential Warranty

See specs at: http://mtiwhirlpools.com/common/pdf/MTSB-6030SEATED.pdf