I just got a new air compressor for occasional finish nailing and tire inflation. I understand that I need to open the bottom drain to let out any condensation (i.e., this question) after each use.
Should I also store the compressor with this valve open? Is it a bad idea to do so? If it makes a difference: I only plan to use it once or twice a month and live in a very dry climate.
Best Answer
Leave the valve closed during storage to prevent moisture, dust, and insects from entering the tank (as @Scivitri wisely mentions in his comment).
Even though any additional moisture could be drained form the tank later, it's more difficult to get the dust and insects out. And they're what's likely to clog up any attachments. They'd also potentially clog the drain valve itself and essentially cause a slow leak until they were removed.