Are the different types of Sight Glass all the same?

19.99 on fleabay.

If the glass is clear plexi glass, you can use polish from your local autoparts store, which will take care of most discoloring and scratches (you can also mix cigarette ashes with foam shaving cream, not the jell and polish with that).

I am a bit confused, because most glass made today does not discolor in the sun, so I am guessing the glass is made of plastic
 
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