These air filter elements are designed as direct replacements to fit the Revotec Dynamic Airflow Universal In-Line Air Filter. Ideal for replacing old or damaged filter elements or to change to a different option.Fits Revotec Dynamic Airflow Universal In-Line Air FilterDirect replacementIdeal for replacing old or damaged elementsAvailable Options:4 Layer Cotton Gauze - Provides 99% filtration down to 2.8 micron particle size, strikes a perfect balance between thorough filtration of fine particles and maintaining high airflow.2 Layer Cotton Gauze -Designed specifically for motorsport applications, the 2-layer cotton gauze filter option maximises airflow, facilitating unimpeded engine breathing while protecting the engine against track debris ingress.