carlon e97abr2 metal cover adapter ring carlon b121bb 1 gang non metallic carlon e97abr2 metal cover adapter carlon e97dsb duplex receptacle floor carlon e97br2 two door duplex br carlon 1 gang 21 cu in adjule thomas betts e971fbdi 2 floor bo carlon e976ak2 rectangular floor box abb e971fb rnd flr bx 90cu d5 4in h thomas betts e9761br floor box covers carlon drop in floor box e971fbdi 2 arlington flbc4500lrbe