Magnetic Oil Drain Plug for my Volvo P1800

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Bought this magnetic oil drain plug for my Volvo P1800 few months ago. Forgot to use it during my last oil change. Paid US$6.83 for it before shipping.

The magnet of the plug is very very strong. It is meant to attract any metal pieces in the engine oil sump tank, serve as another layer of filtering for the oil.

The plug comes with a copper washer. I measured the size to be 18.7mm inner ring diameter, and 25.8mm outer ring diameter. Can round up to 19mm and 26mm I guess.

Shall have the plug replacing my current one soon.