| Also known as | E5370, WW28852 |
| Diagram | Fig. 26 — OIL TANK · ref 17 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1968, 1970 |
TEE PIPE BREATHER 63-67
Crankcase-to-oil-tank breather tee pipe fitting for Triumph twins, PN 70-5370.
This is the tee piece that joins the breather pipes running from the crankcase to the oil tank on Triumph twins. It sits in the breather circuit, splitting or joining the hose runs so crankcase pressure can vent through to the oil tank as the engine turns over. In the parts books it shows up under both the OIL TANK figure and the OIL TANK, OIL PIPES AND BREATHER PIPES figure, which tells you it's really part of the plumbing between those two areas rather than a piece of either tank itself.
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The old-style part number for this one is E5370, and it also carries a WW28852 casting or supplier reference alongside the current 70-5370 number, so if you're working from an earlier parts book or a box of used parts, don't be surprised to see it stamped or listed under one of those instead.
The catalog spans a run of years across the mid-to-late 1960s, which fits with how long this basic breather layout stuck around on the twins before things changed. It's a small, easy piece to lose track of when a bike's been apart, so if you're missing a tee off your breather hoses this is the part to check against what's currently on the engine.
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