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Pop-up Electrical Outlet Box with 2AC Round Receptacles & 2 USB Ports, UL Listed | eBay
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Greenfield Made in The U.S.A. B001APS Series Weatherproof Electrical Outlet Box Extension, Gray - - Amazon.com
NEMA TT-30R 30 Amp 125/250 Volt RV Power Outlet Box, – Journeyman-Pro
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iMBAPrice BE1-1 (1-Gang) Electrical Power Outlet Box Extender - White (Made in USA) - Walmart.com
Buy Wholesale China Surface Mount Power Outlet Socket Electrical Junction Box With Five Holes Power Desktop Type & Desktop Mount Box at USD 5 | Global Sources