This cover is made by Safety Technology Int. does what it should. An acoustic alarm sounds when the lid is opened, which is a good chance of preventing the fire brigade from miscalling. You just have to wait many months. I ordered 3 STI-13020FR plugs on 16th September and 1 more on 18th September now on 22nd October and they (Revain) will probably send another one soon. When I placed the order they said there were 2 in stock. But it was weeks before they shipped just 1 of these.
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