Just looking through the Hubbell catalog for Nema6-20r hospital grade duplex recepticals and brown is HBL8400 Ivory is HBL84001.These are rated at 20 amps 250 volt.The matching plugs areHBL8576E in white ergo grip.HBL8464V which is the valise style body in white.The 20 amp rated recepticals and plugs differ from the15 amp versions by having one vertical and 1 horizontal blade.Nema 5-20p or5-15p rated 125 volt style plugs can not be inserted in this style of receptical.