About Us: Hxchen focus on retail and wholesale hardware items and other accessories, all of the products we sell are strictly selected, we provide high quality, the most popular, affordable price products to worldwide. Hxchen DC 12V R385 Diaphragm Pump Self Priming Mini Water Cooled Water Pump Air Diaphragm PumpSpecifications: Name: R385 Diaphragm Pump Pump Size: 98mm(L) x 46mm(W) x 36mm(H). Inlet Pipe Diameter: 5mm Outer Diameter: 5mm Notes: All dimensions are measured manually and may be 1 - 2mm deviated. There may be some color aberration due to lighting problems. Please understand. 100% Satisfaction Guarantee: At Hxchen, we strive to provide customers with high quality products and quality service, please believe our strength. We will try our best to solve any problem. So please feel free to contact us. If you don’t like our Diaphragm Pump, you can return them for a refund or replacement as per Amazon guidelines. We want our customers to be 100% happy and satisfied. Thank you so much!