The SmartMount^® PLB-1 Back-to-Back Ceiling Mount works with all 1.5" NPT extension pipes for versatility, support, and connection. The 1.5" NPT threaded pipes make it simple to customize each mount to your specific application. The Back-to-Back Ceiling Mount can be used in conjunction with Peerless-AV’s AEC or EXT columns, along with the PLP adaptor plates for custom ceiling mount applications. Each side of the tilt box provides -5° to 2° of forward tilt, and 36° of swivel, making it possible to find the perfect viewing angle. Not compatible with AEC006009  , EXT002 and EXT006 extension columns.