Story: The seal fitted, but the square seal was too big. I will try the RKX Tech brand instead. So there is no guide for it. The o-ring is also designed for the black fitting that connects quickly to the hose. If you have a vacuum pump, remove the fitting and replace this o-ring, then put the fitting back into the pump. The project itself is of medium complexity. If you only have straight fastening tools and no angle or universal tools, you can remove the battery, battery tray and shift linkage [make sure to label this and return it exactly as you found it]. I chose the right set. I had to reuse the old seal. upset.
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