Individual meter sockets have provisions to feed a downstream main lug load center, main breaker load center, or an individually enclosed service disconnect. nits 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 steel closing plate is used to close off unused openings on enclosures that require A-L hubs. Individual meter sockets are UL listed.