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An O-ring for Dosatron injectors. Its dimensions measure .299 X .505 X .103. This is a trusted factory part.
When an O-ring inside your Dosatron injector cracks or leaks it is time to replace it. Swap it out with Dostron 212501V. This replacement O-ring has dimensions measuring .299 X .505 X .103. Since this is a genuine OEM part, it is sure to fit the models recommended by the manufacturer.