Sampling Pumps: The fluid sampling pump is designed to 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 the fittings. The sampling tube is inserted through the coupling device until the lower end extends below the top of the sample bottle. When the knurled knob is turned to tighten the seal, the vacuum will draw fluid directly into the bottle without coming in contact with the pump. The patented feature allows multiple samples to be taken without cleaning the pump between samples. Sampling Containers: Any bottle that has thread size of 38 mm will fit the pump. Usually the plastic bottles in sizes of 2, 4, 8, 16, and 32 ounces are available in the market from many manufacturers. Application: This pump can be used for many applications; here are some proven applications: oil sampling (from crankcases of auto, truck tractor, locomotive engines, heavy equipment, or any internal combustion engines), environmental related fluids, chemicals, water, hazardous fluids that are not easily accessible otherwise.