Adapter plate for Double, 4" Octagon, 4" Square compatible with QNV-6082R/6082R1/6084R/7082R/6072R/6072R1/7082R/8080R, XNP-6040HW, ACV-8080R/8081R, ANV-L6082R/7082R, QNV-C9083R/C8083R/C6083R