Your old work installation needs a box that will not spin in the wall or pull through when you install the device — standard new-work boxes with just nails do not have the holding power you need in existing construction. This 1-gallon PVC remodel box with 4-inch knockout and nail bracket gives you the cubic capacity and the structural mounting for old work situations. 1-gallon capacity for most residential device applications. 4-inch knockout accommodates a range of wiring configurations. The nail bracket is what locks the box into the wall cavity so it does not spin or pull through — the critical difference between a remodel box that works and one that becomes a callbacks. What electricians and remodelers from Sioux City to Norfolk reach for on every existing construction job — the box th Stocked at Crofton Lumber and Akron Lumber.