The F1810HC1 is a fuel transfer filter that strains hydrocarbons up to 10 micron and is designed for fuel transfer systems with flow rates up to 18 GPM. It protects your heavy equipment from contaminates that cause substantial damage and shorten life, such as dirt, rust, microbial growth, and water. Fill-Rite recommends changing filters every 6 months to maintain the highest degrees of protection and performance.