| Also known as | T3851 |
| Diagram | Fig. 2 — CRANKCASE · ref 37 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1974 |
Drain plug (with level tube)
Drain plug with level tube, 57-3851 (formerly T3851), for checking and draining gearbox oil.
This is the drain plug with level tube, part number 57-3851, also listed under its earlier number T3851. The catalog places it in the crankcase area, and other reference listings tie it to gearbox drain/level duty rather than the engine cases proper — so it does double work, letting you drain the compartment and check the oil level in one piece.
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Because it combines a drain function with a level check, it saves you from needing two separate fittings on the case. The single 1969 catalog appearance we have on file doesn't give us a broader year range to quote, so treat this as a part that showed up that season and confirm it matches what's on your bike before ordering.
If your parts book lists this under the T3851 number, that's the same physical part — just the older naming convention.
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