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 may have other threads
We can usually make these from rod stock.
See also Bukh, Petter and Yanmar
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