Features: Diaphragm pump combines the advantages of self-priming pump and chemical-pump. Installed in a dry, well-ventilated location; pumps can not work in water. Return water pump: When the outlet is completely blocked, the motor will not stop running, but the return valves will open and water will circulate inside the pump. There is not much demand for water spray-holes. Using a variety of imported corrosion-resistant materials, self-priming, thermal protection, smooth operation, long-time continuous idling, long-time continuous load operation. Totally sealed, high stable pressure. When the water pressure is too high, pump will protect themselves and normal work, water pipes will not burst, it is safe and durable. PressureSwitch Type Features: When the water turned off, it will automatically cut off power,the motor is stopped. After the water turned on, will automatically power on, motor running. Specifications: Material: Plastic Style: 3201HB reflux pump with right outlet on both sides of the thread/ 3201HD reflux pump 1/2 "threaded right outlet/ 201HA reflux pump, straight pipes on both sides, right outlet Size: As shown in the picture Power supply: 12V Current: 3.5-5A Flow rate: 3.5-5L/min Power: 60w Package Includes: 1x Water Pump note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.