Aeromotive One-Way Check Valve 15107 - High flow one-way check valves designed to prevent back-flow with minimal pressure drop. Ideal to prevent drain back after the fuel pump is turned off, or when dual pumps are used and both pumps may not run simultaneously. CNC-machined billet aluminum and Type II bright dip black anodized finish. AN O-ring male inlet/female outlet connections allow easy installation into fuel pump outlet port without adding additional lines, hose-ends or fittings. Suitable for use with gasoline fuels only.