KOHLER K-4608-96 Serif Toilet Tank, Biscuit (Tank Only) Kohler plumbing products mean beautiful form as much as reliable function Serif tank can combine with Wellworth bowls K-4276, K-4277 and K-4278 and Highline Comfort Height bowl K-4274 Beautifully curved tank and lid offers a fluid, transitional design that blends well with a wide variety of bathroom dcors Constructed of Vitreous China