NITROKITG Air Conditioning Nitrogen Pressure Leak Test Kit. This kit is essential to pre-check Automotive & HVAC systems for leaks due to loose mechanical connections, leaks in hoses, evaporators and condensers, before re-introducing refrigerant back into the A/C system. Save time, trouble and loses due to leaks from charging and recovering multiple times during leak detection and repair. All that is needed is a Nitrogen Tank and a leak detector to perform testing. Typicaly a system is pre-charged with a small amount of refrigerant and topped off with pressurised Nitrogen gas to start work or using a standing pressure method to detect larger leaks. Once finished the gas can be safely vented with no consequences and normal vacuum / charging finishes the job.