Swanstone BT-3060L-042 Bathtub, 30"D x 60"W - Gray Granite. The BT-3060L-042 is a genuine product manufactured by The Swanstone Corporation and has a Gray Granite color/finish. This particular product is a Bathtub that features a left hand drain. The tub is constructed with Swanstone's Veriteck material that does not use a surface coating, but instead runs throughout the tub completely preserving both color and texture. It has a water capacity of 65 gallons which fills from the floor of the tub to the bottom of the overflow. The large water capacity is due to the tubs 16 inch height which is deeper than the standard tub. Dimensions of tub are 30 inches deep by 60 inches wide.