Oatey 30209 Bathroom Sink and Tub Drain Strainers, 8-Ounce High-viscosity formula clings to vertical surfaces Designed for use with all types of tubing, valves, cylinders, pressure tanks and other systems under air, gas and oxygen pressure Can be used in a temperature range from -55 degrees Fahrenheit to 160 degrees Fahrenheit Produces large, long-lasting bubbles to indicate leaks Slow evaporation rate provides long inspection times for leak detection