Sorry if this is on the wrong thread.
I have a water pump that isn't working properly. In fact the pressure tank is empty of gas. It says, on the tank, to refill with nitrogen to prevent rust. That is where my trouble is. I can't find a supply. The fill valve is the same as on a car tyre. Can I fill with air, using a foot pump ? If so will that cause rust problems at a later date ? The gas pressure is for 1.0KG Cm3. Is there a scale that converts that to bar pressure ? Thanks.