Arlington Industries FLBT6615NL-1 Pop-Up Trapdoor Cover with 15-Amp Receptacle and Gasket, Nickel-Plated, 1-Pack For new concrete construction Metal round trapdoor cover with Nickel-plated finish Comes pre-mounted with gasket and decorator style 15-amp receptacle Measures 2.23L x 5.8W x 5.8H A low-cost convenient way to put a receptacle outlet in the floor