Features: 1. Made of high quality plastic material, which is corrosion resistant and durable. 2. Use universal G1/4 threaded pipe connection fittings. 3. The bearing is made of quality material, which is quiet, stable and durable. 4. Easy to install. 5. Fine workmanship makes sure good performance. Specification: Name: adjustable speed XHC8 water cooling silent pump Weight: about 322g/11.36oz Size: about 8*5.5*5.5cm/3.15*2.17*2.17inch Thread size: G1/4 (2 points) The actual outer diameter is 12.9MM/0.51inch Material: engineering plastic Flow rate: 600H/L Head: 4 meters Voltage: 12V Cover surface treatment: polishing Seal: silicone seal ring inside the pump Features: Silent, stable, long life, easy to install, waterproof, diving Package List: 1 * Water Pump Note: 1. Please add water when testing the silent pump. It is strictly forbidden to idling without water, which will easily lead to damage to the pump. 2. This pump is strictly prohibited from overpressure (12V). Please make sure that your power supply is suitable before use. 1、Made of high quality plastic material, which is corrosion resistant and durable. 2、Use universal G1/4 threaded pipe connection fittings. 3、The bearing is made of quality material, which is quiet, stable and durable. 4、Easy to install. 5、Fine workmanship makes sure good performance.