We've used both the black stuff from McMaster, and the Blue Nitrile. The blue is far superior, and is even thicker. If it's style you're going for, ditch it and go with the blue nitrile from McMaster.


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The part number for what we use, and have never had any issues with, is 5994K851
Look it up, and give it a try. As long as you properly attach it, you won't have any problems.