Compatible with all mounts and ceiling adapters using standard 1.5" NPT interface. Unobstructed internal cord routing with 1"x2" outlet opening fits standard VGA connectors. Connectors (sold separately) give ability to extend drop lengths by connecting two or more columns. - Through-column cable routing for an uncluttered look (fits standard VGA connector) - 1"x2" cable outlet opening fits VGA connector post-installation - Cover plate for instances where cable outlet opening is not used - EC extension connectors may be used to extend drop length by joining two or more columns - Compatible with all ceiling interfaces using standard 1.5" NPT interface