Plastic Material: Polycarbonate
Plastic Finish: AR2® coating
Plastic Thickness: vary’s between 0.475″ to 0.485”
Quantity: Sold Individually
Notes: Can only be used with 4” See Through Filter Assemblies
The 4” Replacement Polycarbonate Sight Windows are made of 1/2” thick polycarbonate which also has a thin glass like AR2® (abrasion resistant) coating over both sides of the polycarbonate. This makes the window resistant to scratches, chemicals, solvents, and petroleum oils. These Windows can be cleaned using most all “common brands” of brake clean. The thin glass coating may crack over time because it does not flex or expand with heat at the same rate as the polycarbonate does. Windows should last for years of use but if a crack is visible in the window it should be changed. Sight windows are very easy to change and it is recommended you have a spare and Part #425 O-Ring Kit.