LUBEFLEX Oil Sampling Pump - Oil Analysis Sampling Pump with Vacuum Release Valve - Works with 5/16-inch Hose, 1/4-inch Hose (most commonly used) and 3/16-inch Hose - Made in USA. DONE RIGHT: Oil Analysis Sampling done right. This pump will help you to take samples faster and safer, oil sampling will become an easy task for you. On top of that you will get it done safely, avoiding cross contamination. ADDING VALUE: With our vacuum release valve, taking oil sample will be much easier, just release the vacuum in the pump and it will stop dispensing into the plastic container. This feature will allow you to take the exactly amount you need and make it much cleaner. TECH SPECS: Used with 38mm bottle neck/thread and can be used with hoses 5/16-inch, 1/4-inch (most commonly) and 3/16-inch. Made of aluminum and plastic, the pump is corrosion resistant. APPLICATIONS: The sampling pump can be used for sampling oil cylinders, gearbox, engine, motors, hydraulic system, tanks, drums etc.