Why is a 3" Union Coupling recommended with Waterless Self-Contained models?

3" Union Couplings are a great accessory item for Envirolet® Waterless Self-Contained Systems because they make it much easier to disconnect your vent and access the Works-in-a-Drawer electrical box.

It is installed in the vent, usually from 2" to 2' up the vent line.









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