Perfect shock-absorbing pedestal, especially if you have other equipment by Springfield. 1300601 Plug-In Power-Rise Air-Ride 2-3/8 Springfield Marine "Locking Pedestal System aluminum post with adjustable high strength. Includes any 2-3/8 "base via a plug-in (base sold separately). The receiving pocket should function well as long as it is not tapered and has an interior diameter slightly greater than 2.375 (2-3/8"), as the seat pole's diameter is 2.375 (2-3/8"). The power-rise air-ride element is adjustable from 11 to 18 inches and can handle a load up to 350 pounds. Technical Features: 1. Air-Ride 2-3/8" Pedestal 2. Adjusts from 13-1/4" to 17-1/4" 3. Trac-Lock Locking Air-Ride Swivel included PROS🟢 Convenient height and adjustment Easy to install CONS🔴 The base is sold separately