I bought this Pyrex blue lid to go with my Watercolor 3-quart rectangular baking dish, and it snaps on tightly to keep leftovers fresh in the fridge. It fits the 3-quart Rectangular Glass Baking Dish and the model 233 as described, so no guessing. The blue color matches the Watercolor collection nicely. It is just a lid, so don't expect it to seal liquids if you tip it, but for covering and storing it does the job well.