Vampire Fluid Sampling Pump 38-XV - R&G Laboratories, …
Description. Vampire Pumps draw a vacuum of 27 inches of Hg (Mercury). The patented tube coupling device accepts any size sampling tube (with an outside diameter of 3/16" through 5/16") without changing fittings. The sampling tube is inserted through the coupling device until the lower end extends below the top of the sample bottle.