NDS 117BC 13 20-Inch Valve Box Overlapping Cover-ICV, Jumbo, 13" x 20", Black/Green
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Questions & Answers
Taking the outside dimensions as a starting point To subtract about one-quarter" add about one-half".
The base measures 14 w x 19 l on the inside!
The water was about a foot deep, if I recall correctly. It may be helpful to you.
A lock cannot be used on the box