This general purpose ultrasonic couplant gel holds on to horizontal and overhead surfaces. The R7950/5L is designed to work with ultrasonic thickness gauges and is ideal for iron, steel, aluminum and titanium surfaces. REED R7950/5L Offers Features 5 liters (1.32 gallon) barrel Slow drying with good transducer lubrication Water soluble Includes applicator bottle Material Safety Datasheet (MSDS) available upon request Included Ultrasonic Couplant Gel Applicator Bottle