Smarter Flush 2 in. Dual Flush Complete Kit comes with dual flush valve, black donut gasket, 3 stainless steel bolts and nuts, heavy duty fill valve, overflow water conserver, and easy to follow pictured instructions (English and Spanish). The 2 in. Dual Flush Complete Kit works with nearly all major toilet manufacturers. The Complete Kit is easy to install and will save you both time and money by reducing maintenance and saving water daily. Confirm the size (2-inch or 3-inch) of your toilet before ordering to assure selection of the appropriate Smarter Flush product. Determining the size of your toilet can be accomplished by performing one of the following exercises: (1) If your toilet has a rubber flapper, measure across (or the diameter of) the flapper. A 2-inch toilet's flapper will measure a little larger than 2 inches. A 3-inch toilet's flapper will measure a little larger than 3-inches. OR (2) If the discharge hole opening looks about the size of a baseball or an orange, then you have a 2-inch toilet. If the discharge hole opening looks about the size of a softball or a grapefruit, then you have a 3-inch toilet. Material: Plastic.