Swanstone SS-3448-131 Single Threshold Shower Floor, 34Dx48W - Tundra. The SS-3448-131 is a genuine product manufactured by The Swanstone Corporation and has a Tundra color/finish. This particular product is a Single Threshold Shower Floor that features a center drain. A slip resistant pebbled design pattern is molded into the shower floor for added safety. Also includes a Fit Flo shower drain which is already molded into the floor. It features a solid surface which will not mildew or mold. Dimensions: 48 inches wide by 34 inches deep, with a 4-1/2 inch height.