Premier Mounts 6x6" PP-5 television monitor ceiling mount adapter plate has a 1-1/2" threaded coupling for national tapered pipe. It is used in conjunction with one of our 1-1/2" single-pipe adjustable-height suspension adapters (ASA-2446 or AST-2446) for drop distances of more than 3''10". Pipe coupling is slotted for safely routing signal cable through pipe interior.