Springfield Plug-In Locking Air-Ride Post - 14-1/4" to 21" [1300901]Plug In Locking Air Ride Post 14 1 4" to 21" Features: Pedestals Can Be Locked In Position To Prevent Rotating Or Unlocked To Rotate Freely Provides Safe, Stable Seating Fits Any 2 3 8 Plug In Base (sold separately) Rated ABYC Class H 31 B (Fishing Only) WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov.