These valves are the perfect choice for a close clearance engine oil drain application. These low profile oil drain valves are designed to clear retractable landing gears and other restrictions. The valve is very affordable and can be rebuilt. It is a simple procedure to sample or drain hot oil. Merely screw on the opener adapter and slightly open the valve for a sample, or fully open for complete drainage. The valve is made from 360 brass and 302 stainless steel. FAA & PMA approved.