The Mansfield Alto Toilet Tank Model 160-BONE is a Bone 12" rough in tank made of vitreous china and is the tank only. It has a water usage of 1.6gpf/6.0lpf due to its quality fixtures, and because of its smart flush technology. The Mansfield Alto Toilet Tank Model 160-BONE is compatible with the toilet bowl models 117, 130, 131, 135, 137, 138, and 139S. This tank is also affixed with tank trim, tank to bowl gasket, washers, bolts and nuts, and a trip lever for the easy installation to the rest of the toilet. The Mansfield Alto Toilet Tank Model 160-BONE comes with a limited Mansfield lifetime warranty. Mansfield is an American company that?s been in business since 1929, and has been one of the top producers in design, and quality for the past 80 years. They are the largest domestic producer of sanitary ware, and strive to ensure you get the best products available.