| Listed in parts books | Not catalogued by year yet |
BILLET AL 500 UNIT EARLY SUMP PLUG - 20TPI (1958-68) With Magnetic Drain (Use 70-9501M for Late)
Billet aluminum magnetic drain plug, 20 TPI, for early (1958-68) unit 500 Triumph sumps.
This is a billet aluminum sump plug for the early 500 unit-construction engine, cut with a 20 TPI thread and fitted with a magnetic drain to catch metal fines before they circulate back through the oil system. It sits at the bottom of the crankcase where the factory drain plug normally lives, and swapping in a magnetic version gives you an early warning sign if the engine starts shedding metal.
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The catalog note ties this one to the 1958-68 early-style sump, so it's worth checking which drain plug thread your particular unit 500 takes before ordering. If you've got a later engine, the shop stocks 70-9501M instead - the two aren't interchangeable.
Being aluminum rather than steel, it's a straightforward swap for anyone doing routine oil changes and wanting a look at what the magnet picks up over time.
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