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The 3M 50-1265 is the correct replacement bypass plug for the following systems:
The 3M Bypass Plug, also known as part number 50-1265, fits in the filter head of your RV Drinking Water Filtration system. This water filter bypass plug allows anti-freeze to flow through the water line.
3M Bypass Plug specifications:
This 3M Bypass Plug is ideal for winterizing your filtration system and is used in place of the filter cartridge.