Another good try to sneak one by.
Hello fellow backflow techs!
I know most of the testers are in various levels of skill and ability.
You never know what you will find.
Don't be the tester that lets somebody sneak one by.
Take your time and enjoy the repair.
The pictures will explain.
Your Gauges are your best friend.
If your gauges are not your best friend, get new gauges.