Klann Tools KL-4021-3113 Socket Insert 13 mm hex, 1/2" (length 100 mm)
Allows quick and trouble-free loosening and tightening of the central retaining bolt of the fuel cooling unit - when replacing the fuel filter.
This special socket may also be used to remove and replace the brass insert on injector valves on Audi gas engines - 1990 and newer.
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