Underhill VL-6P VersaLid 6&rdquo; to 7&rdquo; Universal Sprinkler Valve Box Lid - Purple Universal replacement lid  round valve box lid residential and commercial applications Sure fit for all 6-inch to 7-inch round boxes; Greater top load strength and more UV-resistant than lids made of structural foam Purple lid cover for non-potable/reclaimed (non-drinking) water Stepped locking system; T-top design -- mow strike prevention Interchangeable, easy to install; commercial quality