Usage Tips:Easy to use: Just connect a standard 1/4' refrigerant hose and a standard nitrogen pressure regulator to quickly switch between the three modes of "purge, braze, close", unlike nitrogen purge tools with dials so troublesome.No fumbling with a flow indicator valve. Extend the service life of HVAC equipment: Help nitrogen flow smoothly into pipe fittings during purging and brazing, remove refrigerant, moisture and debris, prevent oxidation and equipment failure, keep pipes clean, extend the service life of metal pipes, and help you save a fortune on estimated repair costs. Precise and affordable: the nitrogen flow is precisely controlled to achieve more stable and precise purging and welding effects, avoiding unnecessary gas waste. Sturdy and : All-metal structure, and wear-, compact and , can be placed in tool bags, tool boxes, pockets and other places you find convenient without worrying about any wear or breakage. Comfort and peace of mind: The knob design is ergonomic Material: Metal Color: As shown Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 x Nitrogen Purge Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.