Timco Air & Gas Leak Detector Is A Professional Formulation Designed To Quickly And Reliably Detect The Smallest Leak In Pressurised Systems. Reacts Instantly Upon Contact With Gas And Air Pressure Forming A Stream Of Bubbles To Identify The Leak. Ideal For Refrigeration Units Air Conditioning Systems Exhausts Pipes Valves Screw Connectors Welded Seams And More.PTDTIM237023