This H2Option tank is designed to work with toilet bowl models 3705.216.222, 3707.216.222, 3706.216.222, and 3708.216.222. This toilet tank purchased with the corresponding toilet bowl will form the following American Standard toilet models: 2889.216.222, 2887.216.222, 2888.216.222, and 2886.216.222. This tank has the dual-flush option which uses 1.6-Gallon-per-flush (6-lpf) for a full flush and 1-gallon-per-flush (3.8-lpf) for a conserving flush. The tank is also incorporates a antimicrobial surface additive called EverClean right into the material to protect it from mold, mildew, algae, and fungus that could cause deteriorating or staining. Check out all of American Standards bathroom and kitchen fixtures to see a complete list of lavatory and kitchen products available for your home.