Square D EZ Meter-Pak meter centers provide reliable, versatile, and compact multi metering equipment for multi unit residential and commercial construction. The main devices are available as main circuit breakers, main fusible switches, or main lug terminal boxes, and residential and commercial branches are available in ring or ringless type. EZ Meter-Pak meter centers have accessories and spare parts for field replacements and design flexibility. This part is a one position meter socket replacement kit, line side through tenant breaker base. It is a part for a single phase, 125A branch unit.