Water Fill Adapter. Many competitors put water in their tires to lower the center of gravity of their trucks. This makes the trucks more stable and less likely to roll off the course.

Screws directly onto the valve stem. You must remove valve core.
Specs:

• Warranty: 12 Month Limited Warranty
• Sold As: Each
• Material: Metal
• Finish: Bare
• Color: Grey
• Fits: Non-vehicle specific