Wheelock WBB-R Weather Resistant Back Box, Red, Designed for 31T, 43T, AHWP, ET-1010, MB and MT4 Mounting Horn Strobe Series, Painted to Match the Signal Key Features Designed for 31T, 43T, AHWP, ET-1010, MB and MT4 Mounting Horn Strobe Series Sturdy die cast housing, threaded conduit hole and knockout for outdoor applications Painted to match the signal