The HDPRM2 parapet and flat-roof mount has a unique rotating 1.5" NPT threaded mounting nut that allows the dome to be installed without twisting the dome and wiring. The dome can be swiveled toward the roof for convenient rooftop servicing and adjustment. The HDPRM2 is constructed of heavy-duty steel for maximum strength and durability. It can be mounted to a roof parapet or to a flat roof surface and can support a maximum load of 20 lb (9.1 kg). When properly fastened to a support structure, the HDPRM2 can withstand winds up to 75 mph (121 km/h).