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. The AAP adaptor plate allows a Series A style hub to be used on a device that is setup for a Series A-L style hub. Individual meter sockets are UL listed.