Rotating Bumper 4S
Fits 4″ Square Post


One complete boat dock bumper/roller for 4″ square post includes:

  • Internal attachments: Bushing and hardware
  • 2 Outer hemispheres that when assembled create one bumper/ball
  • Assembled sphere/ball dimensions: 16″x16″
  • Be sure to confirm post size before ordering.

! Watch Installation Video for Details !

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WhamGuard Rotating Boat Dock Bumpers are premium boat dock rollers that provide boat dock protection and look great. They are specifically designed to rotate while guiding a boat into and out of a boat slip. One person can easily install a bumper in minutes. WhamGuard Rotating Boat Dock Bumpers are made of lightweight, durable, marine-grade polyethylene. They have a 15 year UV rating and are custom-molded for protecting boats and dock structures. Multiple color options are available. Customize your look to your favorite color, team, or complement your boat.

All components necessary to install the boat dock roller on a 4" dock post are included and ship for a flat rate of $25 or $30 per roller or "ball”, depending on location.  If you are local to North East Oklahoma lakes, you can arrange for a pick up in Bernice, OK or Tulsa area to avoid shipping charges. If at any time you have questions or need help, call us directly at 918-416-1600.

Return & Refund Policy

Additional information

Weight 10 lbs
Dimensions 16 × 16 in