I recently replaced the pump in our 60gal Kobalt (campbell hausfeld #0054284 model #vt6362) air compressor only to find a leak from the unloader valve. We replaced the pressure switch and unloader valve but there is still a leak from the unloader valve. Once I remove the unloader valve from under the pressure switch the leak stops. The leak is coming from the unloader valves nipple thing which is compressed when it's in place causing the valve to open. How do I prevent this? Do I need a new part elsewhere? Thank you.