Non-marking air-filled roller cushion Integrated needle valve puts you in control of air pressure Fits Norestar DW-C-12WH, DW-S-12WH dock wheel mounts Description This replacement bumper wheel fits the Norestar Dock Wheel Fender mounts to safely fend your boat from the dock and help guide the vessel safely into position. The wheels roll along the sides of your boat rather than drag, which prevents scuffing. Using the integrated standard needle valve and an inflation needle (sold separately), you can adjust the air pressure of the wheel to your ideal firmness using a typical sports pump. The Dock Wheel should not be installed upside down or in a situation in which it will be submerged due to the compression fitting.