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This 6" x 6" 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.
National Tapered Pipe