Due to age and sun exposure my sight glass shattered during last backwash and left the threaded end in place. How to get that sucker out? I read an older thread about this issue and tried all suggestions with no luck. I then
decided to use a very small, but rigid automotive pick tool. I gently tapped it into the plastic glass enough to get some leverage and it snapped right out. Hope this method will help someone else and save you some time.
Blessings to all ...

Blessings to all ...