DURABASE® square, single threshold shower floor model as manufactured by E.L. Mustee & Sons, Inc. Floor to be one-piece, molded fiberglass, made with matched metal molds. Surface to be slip-resistant Starburst® design that does not interfere with the flow of water. Size 36 x 36 in. Shoulder will be no less than 3 in H or less than 1 in W. Tiling flange will extend not less than 1 in higher than the threshold which provides an integral molded water barrier. Threshold will be not less than 4-1/2 in H. Molded-in drain and drain seal for installation of 2 in iron DWV (SCH 40) PVC or ABS sanitary drain pipe. Removable strainer. Shall meet ANSI Specification Z 124-2011.