The only reason for 4 stars instead of 5 as someone else mentioned is that it comes with a weird connector that doesn't fit a normal cartridge. I don't usually mind too much as most tools don't even fit fittings, but for some weird reason they cover the threads with red lock so it hurts to pull out and you worry about the threads fraying. the whole time. However, once I got air, the tool worked great. I used it to flush the brake system and the tool allowed me to pump out all the old fluid and completely bleed the system with new fluid and the job only took about 15 minutes once the car was airborne. The pedal was rock hard the first time. Great tool. Tip: Turn on the device and allow it to create a vacuum in the line before opening the bleed screw, and close the bleed screw before turning it off. This is the process for any strength builder, but I thought I'd add that
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