Medical devices and methods for using medical devices are disclosed. Example fluid reservoirs and tube sets arranged and configured to couple to an endoscope for use in an endoscopic procedure are disclosed. An example fluid reservoir and tube set includes a fluid reservoir configured to contain a fluid, a fluid supply tube configured to be coupled to the endoscope and having a lumen extending therethrough, wherein the lumen is in fluid communication with the fluid reservoir and a first backflow prevention mechanism coupled to the fluid supply tube, the first backflow prevention mechanism configured to permit fluid to flow through the fluid supply line from the fluid reservoir to the endoscope and to prevent fluid from flowing back through the fluid supply tube from the endoscope to the fluid reservoir.