Features . 3 point roller design assists in anti siphon protection. Pump head requires no valves allows for easy maintenance. Self priming against maximum working pressure foot valve not required. Pump does not lose prime or vapor lock. Pumps off gassing solutions and can run dry. Output volume is not affected by back pressure. Easy to change pump tube lubrication is not required. Pump tubes and pump heads interchange between models Specifications . Size 0 25 in . Weight 8 3 lbs