My propane regulator requires a 7/8" wrench to attach it to a propane tank.
Newer designs have a plastic thumbscrew that fits over the metal parts and allows you to screw the regulator to the propane tank by hand.
So, I created an adapter for my propane regulator to eliminate the need for a wrench to attach my regulator to the tank.
See instructions for what you need and how this may help you.