WARNING!
Always place the pipe wrench on the metal connections and not the sight glass itself when tightening.
Do not tighten or loosen while under pressure.
Avoid direct contact with strong acids or chemicals such as carbon disulfide acetone, etc.
The PETOL™ Sight Glass is to be used on drain lines ONLY. NEVER use on flow lines.
Always use an oily rag when cleaning the sight glass.