Non-Automatic Bilge Pump (03) by Rule Pumps®. Capacity: 1500 GPH. Voltage: 24 V. 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. Range of higher capacity standard bilge pumps are usually operated via a float switch or another level-sensing device, and give outputs from 1500 GPH (5678 LPH) to 4000 GPH (15141 LPH).