Check the listing for details. BoxLok Valve Box Centering Device for Gate Valves BoxLok-1. Condition: New. Listed at 40.00 USD. BoxLok-1Gate Valve Valve Box Centering DeviceBoxLok is a polymer disk that can go under the valve key on a water main gate valve. The disk helps keep the valve box centered over the valve when backfilling and over time if the ground shifts. It has two halves that click together. The white color also enhances visibility of the valve operating nut making it easier to see the condition of the valve operating nut The hole in the center is designed to fit around various manufacturer valve stems, so please look at the charts below before ordering to see which fits your valve brands and sizes.We recommend all utilities keep some of these on hand for new construction and to do a better job in valve box replacements.ELIMINATE VALVE BOX SHIFT DURING BACKFILL WITH THE BOXLOKSNAPS AROUND THE VALVE STEM— UNDER THE OPERATING NUT, ABOVE THE SEAL PLATEWORKS WITH NEARLY ALL BURIED VALVES WITH VALVE BOX ACCESSLOW COST SOLUTION TO A HIGH COST PROBLEMFOR USE WITH CAST IRON VALVE BOXES, AND 8” PVCModel BoxLok-1 Fits these valve brands/sizes:AVK Valves sizes 2"-12"AFC, Mueller, and J & C Valves sizes 10"-12"EJ, and US Pipe sizes 12"See other models or dimensional drawing for other uses.MORE THAN 100,000 IN USE TODAYMADE IN THE USAWe are a factory authorized distributor - Need a larger quantity than listed here? Please contact us.SIZE SELECTION FOR USE WITH STANDARD CAST IRON VALVE BOX OR 8" PVC PIPE.BoxLok O.D. 7.5"THIS IS AN ALIGNMENT DEVICE, NOT A LOAD BEARING UNIT