Thanks for sharing your mishap, at least no damage was done. I always use a torque wrench since I am notorious for over-tightening plastic fittings. I noticed that the Mercedes symbol on the plastic housing is at the 12:00 position when properly tightened.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles