"U" style locking kit is designed to be used with "DE" style high pressure ball valves. Will fit both 2-way and 3-way ball valves with port sizes between 3/4" - 1 1/2". Ball valve handle should be marked "SW14".

Video instructions for installing locking kit can be found on the manufacturer's YouTube Channel: https://youtu.be/YjUedUGMxYM