Rough-In Kit/Vapor Dome/Back Box Combination (8" Rectangular) - OEM SYSTEMS Inexpensive & versatile Mounting straps span 24" members Dome/mounting flanges slide along straps for positioning at any point between members - substantial friction holds dome fast Wire inlet for easy wire location Shields speaker from insulation Wide flange for restoration of vapor integrity For OEMSE893KE: Rough-In Kit/Vapor Dome/Back Box Combo For OEMVPD5: For 8" rectangular Oem Systems Vpd-82 Rough-In Kit/Vapor Dome/Back Box Combination (8" Rectangular) Speakers - Speaker Back Boxes