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Noise reducing clamps are designed to provide a secure professional fixing when you are connecting carbon filters, fans, ducting and silencers together. They help reduce and eliminate any noise associated with a ventilation system and provide a professional fixing finish.
6 Inch Noise Reducing Clamp Collar Features:
climping is at its complete sealant
I am not sure who measures your clamps, but they obviously dont know maths you guys have a 6" camp diameter for the inside of a tubing not outside. your dimensions are off. it doesn't fit.
