Use this heavy-duty 1 HP submersible waterfall pump when a lot of pressure is needed at a minimum of 20. 3 outlet. 20 power cord with thermal overload protection. Top quality Japanese double mechanical seals provides for over 100,000 hour life expectancy. Two year manufacturers warranty. Use ball valve to create back pressure for system that has less than 20 head pressure. Draws 11 amps. 115 volts. Maximum 8000 GPH. Maximum 40 head. Approx. 11 diameter. 18 tall.