Snake Oil..... The idea of using a sacrafical anode has been arround for some time, but the anode has to be in contact with the block,

Basically on boats, the anode is attached directly to the motor, or directly to the hull of steel boats, Just dangling in the rad tank will do nothing.

Im an engineer and a sailor, and I would not buy this product. my 2 cents.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D