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7mm. I bought my wrench from Aliexpress and cut it down. It’s still not perfect. I would use a 12 point 7mm. The trick is to work with the small area available and the 12 point would allow the valve to be opened and closed without taking the wrench much off the valve. It’s a stupid design because this has to be done by feel and it’s easy to lose track of where the valve is which is important when you have fluid flowing out.
Agree with JohnM. I just bled the slave last weekend, and it’s a bit nerve racking when the fluid starts flowing and the wench slips off the bleed screw. Others have experienced the tube slipping off the bleed valve, with brake fluid running down their arm. Next time I do this I’m using a closed end 7mm wrench and a tighter tube.
Here’s a Thread that I posted in the 993 Forum that may be of some help.
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