Rothenberger Rotest leak detecting solution offered in an atomizer bottle accurately it locates leaks in gas cylinders, appliance connections and joints. The majority of gases including compressed air, natural gas, coal gas, butane, propane, carbon dioxide and freon can be detected using this device. Rotest leak detector spray is used for the detection of leaks in joints, appliance connections and gas pipes. The 250ml spray bottle is suitable for use with the majority of gases including natural, propane, and butane. Safe to use the liquid is soluble in water. ROTEST Leak Detection Fluid for safe leak detection on gas lines Safe to handle - non acidic, non flammable, non corrosive, biodegradable and soluble in water Atomiser allows you to spray directly to required area Simple use - always ready to use 250ml.