A: The interior dimensions for our Orbit Rock cover is 19x13 inches and we only make one size.
A: Our rock valve box cover has an internal measurement of 19x13 so it would be tight.
A: This rock cover will not cover those dimensions. It will only cover up to 19x13Inches.
A: Yes I also have a three value sprinkler system and thus Rock works great, also I did have to do some small alterations on the Rock