Rule 1500. Non-Automatic 24v. High pumping capacity and reliability at a lower cost. The Rule 1500 offers more pumping capacity and more exclusive design features than any comparable competitive pump. 1-1/8" (28.6mm) discharge outlet.. 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.