Valvtect Marine Bioguard Plus 6, 1 Gallon. Multi-function diesel detergent & pesticide combination. Contains Diesel Guard Supreme, a multi-functional diesel additive that contains stabilizer, moisture dispersant, corrosion inhibitor, detergent, cetane improver and VT 101 lubricity improver. Improves performance, power and stability of your fuel for more than 2 years. Also contains a highly effective microbiocide to prevent biological growth and corrosion of your fuel tank and engine system.