Cracked barrel nuts are one of the most common causes of leaks in Fluval FX canister filters. Over-tightening the lid clips can easily damage the originals - leaving your filter loose and prone to leaking.

Our compatible barrel nuts for Fluval FX2, FX4, FX5, and FX6 are a cost-effective replacement that restores a secure, watertight seal. 

Each set includes 8No high-quality replacement barrel nuts for your Fluval FX filter.