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This gear clamp is used to secure 4" aluminum fresh air intake to Z-Vent concentric kits (such as 2SVSHTC04S) or termination hood to a 4" air intake on the appliance (water heater, boiler, etc.).
It can also be used as a replacement for a worm gear clamp which comes standard on all Z-Vent pipe and fittings.
It can also be used as a replacement for a worm gear clamp which comes standard on all Z-Vent pipe and fittings.