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RV water heater vents are a favorite nesting spot for mud daubers, wasps, mice, and other small pests, and a blocked vent can affect how the appliance burns and vents. This JCJ screen mounts over the outside vent opening to keep them out.
The stainless steel screen and mounting springs are sized so they don't restrict the airflow the water heater needs to operate, and the whole thing installs with the included tension springs and installation tool.
A cheap bit of insurance against a clogged or nested-in water heater vent.