Individual meter sockets have provisions to feed a downstream main lug load center, main breaker load center, or an individually enclosed service disconnect. Units can have a combination of releases, horn, or no bypasses to handle any meter socket situation. Units supplied with hub opening in top end wall require the use of a bolt-on hub or closing plate. This bolt on hub has a 2.50 inch conduit for use on enclosures that require A hubs. Hub is fastened to the enclosure with four 12-24 x 1/2 inch slotted hex washer head screws. This hub is rainproof and measures at 3.31 inches tall, 3.31 inches wide and 1.03 inches deep. Hub is UL Listed.