* 1 GallonWater Based Contact Medium for Ultrasonic Transmission* Transgel is a water soluble ,non greasy and non staining ultrasonic coupling medium which provides superior wave transmission for diagnostic and therapeutic application requiring a viscous and non spermedical gel* Deep cleanse and moisturize.* It can also be used for diagnostic and therapeutic applications requiring a viscous and non-spermicidal gel. It spreads evenly and will not dry or leak under the transducer or electrodes during treatment and diagnostic procedure.