FastCap PVC Electrical Box Trim Caps. Designed to trim the cut out for a standard plastic 2-1/4" x 3-3/4" electrical box. The Electrical Box Trim Cap not only trims the rough or misaligned cut outs, but also provides for an air tight seal around the box to the cut out. Sold by the box - 5 sheets per box. Each sheet contains 1 - Electrical Box Trim Cap and 23 - 9/16" diameter FastCaps.
