Square D 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 accessory is a hub which is rated for 3.00 in wire size on Series A L systems. This hub is rainproof and measures at 5.00 inches tall and 5.00 inches wide.