replaceable zinc pencil and a
separate brass plug
Dimensions are usually given as length of body x diameter.
The threaded part is extra and defined by
it's diameter and the thread name. Measurements are
in turns per inch (tpi) for Imperial or 'the pitch' (distance between one turn and the next) for metric threads.
Various engines inc.VW have a large variety of screw in anodes. If our die cast anodes will not fit we can usually make others from rod stock or replace the brass plug to take a cheaper anode.
See also Bukh, Petter and Yanmar
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