PM1054This 6"" x 6"" adapter plate has a 2"" threaded coupling for national tapered pipe. It is used in conjunction with Premier"s 2"" single-pipe adjustable-height suspension adapter (AST-2446/2) for drop distances of more than 3"10"". Pipe coupling is slotted for safely routing signal cable through pipe interior. NOTE: A signature is required for all Premier deliveries