CFC Unit filler cap O-ring Viton 38x2.5mm Replacement O-ring for the CFC Unit filler cap. Viton O-ring, safe for all types of fuels, including alcoholic fuels. Use together with the filler cap for the Nuke Performance CFC Unit. Make sure to replace damaged O-ring to guarantee perfect seal, function, and safety. Used on Nuke Performance products: CFC Unit, Competition Fuel Cell Unit CFC Unit for ATL fuel cells, Competition Fuel Cell Unit   If you wish to change or complement the use of spare parts of the highest quality, we recommend that you use original parts which are designed to withstand high power and excessive wear and in the right combination with the products they were intended for. Quantity : 1pc