Rule 3700. Heavy duty construction for both commercial and pleasure boat use; known for trouble free operation and reliability. 1-1/2" (38mm) discharge outlet. 12 Volts DC unless noted.. Features:. Fully Submersible. Easy clean snap lock strainer. Silent and vibrationless operation. Anti-airlock protection. Compact, efficient long life motor. Ignition protected. No burn-out when run dry. Rust and Corrosion protection. Used by leading boatbuilders worldwide. marine grade blocked wiring. WARNING: This product can expose you to chemicals including FORMALDEHYDE (GAS) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.