Air regulator problem

The air regulator was leaking air and the air in the bay for presoak was sputtering.  So I decided to change out the regulator.

I had to grind off the screw to get the block off.  Then I decided to change out the metering.

The new air regulator which was used would not turn the psi lower then 80.  Then I gave up and decided I needed a new regulator.  I then noticed that the air and the chemical are in a tee together with no check valve.  So I had to cap the air block.