The link to Rule 500 GPH Automatic 12V Bilge Pump has been copied
Rule 500 GPH automatic, fully submersible 12V DC bilge pump provides outstanding quality and value. Automatic pump turns on and checks for water approximately every 2-1/2 minutes. If resistance (water) is found, it will run for as long as water is present. When all the water is pumped out, the pump shuts off and returns to its 2-1/2 minute test cycle. Pump is designed with a small hole underneath the strainer tab that acts as an air vent to prevent air-locking. Protected against rust and corrosion, the pump is constructed with a stainless steel shaft, nylon impeller, and marine-grade blocked wiring. It is economically priced and designed for small boats. Compact bilge pump features silent and vibration-less operation, efficient long life motor, and ignition protection. Will not burn out after running dry. NMMA, IMCI, CE certified. 3-1/2"H x 2-3/8"W x 2-3/8"D.