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. The side closure cap is a replacement left side end cap for EZM cross bus opening for EZM mains units.