This Watson Marlow 701R Pump Head High Flow Driven Roller Pumphead without Tube Clamp came from a local lab that had surplus lightly used equipment. Unfortunately, the tube clamp is missing and will need to be replaced prior to operation. As a result, this unit is being listed for parts or not working condition. We urge customers to view all photos as they show overall condition, included accessories and useful information. Listing only includes what is shown in photos. Please feel free to contact us with any questions.