Solvent sight glass mod. F
This kind of sight glass is a simplified version of the MD model.
Model F has a single glass, sealed and tightened with a ring nut, and may come equipped with its special lamp and drip on request.
Like the MD model, this is made of nylon 6.6+30% certified-quality fiberglass, using "FAR"-proprietary moulds, again guaranteeing the proper strength and useful life.