Close the new valve. Open the water-main shutoff valve and let the water run until all the air is out of the pipes. Then shut off the upper and lower faucets. Check the new valves for leaks.

“Existing valves on most water heaters are not full port valves,” says Barnes. “This means they are not the actual pipe ...

A sprinkler system employing automatic sprinklers attached to a piping system containing air or nitrogen under pressure, the release of which (from the open sprinklers) permits the water pressure to ...