Thing to remember with the constant pressure clamps is not to molest them significantly. Jerking, twisting, pulling or what have you, with a good degree of tension from pliers will , depending on the state of the clamp, Bend it! and there goes your sealing capacity. It happens, but only if your really tugging on it.. for what its worth, I really like these much more above the other screw down type you get from the auto store.
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