Phase II+ UTG1000-808 Bottle of Couplant Gel (8oz)UTG1000-808 Bottle of Couplant Gel (8oz)x Water based and water soluble Extended ambient temperature range Slow drying with good transducer lubrication MSDS/SDS available by request Stable couplant that holds on a vertical and overhead surfaces and fills depressions in rough surfacesUTG1000-808 Bottle of Couplant Gel (8oz)Phase II Plus UTG1000-808 Bottle of Couplant Gel (8oz) for Ultrasonic Thickness Gauge.