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