The AST-2446 1½" pipe adjustable height suspension adapter provides adjustable height compensation of 24" to 46" (12" to 24" with cut) in 1¼" increments for drop or high ceiling type installations. It uses 1½" standard NTP (national tapered pipe) and tubing. PBM series projector mounts and PDM-series plasmas mounts that mate directly with the PSD-S 1½" pipe plasma wall to ceiling mount adapter can mate directly with the AST-2446. If additional length beyond 46" is required you need only add the desired length of threaded 1½" NTP pipe with a threaded coupling.