Leviton GCM20 Manual Reset In-Line User Attachable GFCI Grounded Plug Adapter, 20 Amp Rainproof, outdoor rated GFCI module Fully complies with nec and osha regulations for construction sites Polycarbonate, ultrasonically welded body provides long service life and excellent resistance to harsh weather Terminal chamber sealed with silicon and foam rubber gaskets for superior protection against moisture Accepts 12/3 awg through 18/3 awg types sj and St cords