Usage Tips:Quick cool gas adjustable joint Inclosed the high and low side coupler The valve core puller is adjustable to fit the different valve core Excellent for replacing valve cores without unloading or recovering the system Internal ball valve retains load & allows access to automatic a / c systems Use: At this point you must put on the gloves and goggles, and then you can replace the valve core as described below. 1. unscrew the low-side (or high-side if that's what you're fixing) port cover 2. connect the valve removal tool 3. insert the extractor 4. loosen the old valve core 5. pull the valve core up 6. remove the valve core 7. the valve core is now out 8. Place the valve core on the stem 9. install the valve core 10. put the protective cover back on the low side door Red for the high side and blue for the low side The core of the extractor valve is adjustable to adapt to different of the valve core Excellent for replacing the valve core without unloading or recovering the system 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 Colour:Photo Color Material:Metal Package Contents: 1 x Valve Core Remover Tool set 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.