Water Meter Adapters, To set a 5/8" x 3/4" Water Meter into 1" Meter Setter (368-0641, A24)Water Meter Adapters To Downsize a 1" Water Meter to a 5 8" x 3 4" meter or 3 4" short (7. 5") meter To maximize revenue and meter accuracy, you should always use the smallest size meter that will handle the flow rates required of the building tenant. These adapters allow easy downsizing of meters without re plumbing the meter setting. For installing a 5 8" x 3 4" or a 3 4" short (7. 5" lay length) into a full 1" meter setting. Upsizes thread diameter