Square-Duct outdoor raintight wireway is used to protect electrical wiring against rain, sleet, and physical damage. Raintight troughs are designed for ganging meter devices, panelboards, switches, and circuit breaker enclosures. Each length is a completely enclosed section with a removable cover that has provisions for sealing. This Square-Duct raintight closing plate for 4 inch by 4 inch wireway. This wireway is constructed of 16 gauge galvanized steel and is rated NEMA Type 3R.