This Oatey 38530 is a professional-grade shower drain valve assembly. It's designed for a 2-inch drain opening and fits standard PVC or ABS Schedule 40 DWV pipe. The valves are made of brass with a 1/4-turn operation for quick on/off control. It features Oatey's cool \Lock and Load\ mounting system and a single-lever hub that makes positioning and securing the valve super quick and easy during installation. The versatile design allows for right, left, or center drain placement, and it can be mounted from the top or bottom. It includes a unique test cap that's easy to install and remove and won't accidentally fall into the drain. The kit comes with a high-impact polystyrene box (roughly 8.75\W x 7.5\H x 3.625\D), a snap-on faceplate frame that accommodates up to 1-inch drywall, and four support brackets. The faceplate itself is 11.75\ wide by 10.125\ high. It's a complete, well-thought-out solution for shower drain installations, simplifying inventory and saving time for plumbers and serious DIYers.