Heres a reference sheet for the accepted types of plugs.
http://www.frentzandsons.com/Hardware References/twistlockplugandreceptacle.htm
Installing a waterproof rated plug and receptable is overkill? Code states a locking receptacle, most of the plugs like the one I posted above lock using the lid to retain the plug.
Bryant makes a kit if you want the twist lock style, it at least comes with a cover.
http://www.hubbell-bryant.com/literature/bss110.pdf
http://www.frentzandsons.com/Hardware References/twistlockplugandreceptacle.htm
Installing a waterproof rated plug and receptable is overkill? Code states a locking receptacle, most of the plugs like the one I posted above lock using the lid to retain the plug.
Bryant makes a kit if you want the twist lock style, it at least comes with a cover.
http://www.hubbell-bryant.com/literature/bss110.pdf