NICE aluminium oil cap breather
The M20 x P2.5 thread on this oil cap breather is the size you are going to want for your Honda Grom or Honda Monkey 125, took me a little researching to confirm this so thought I would mention this here to help people out. The part itself is very nicely made from aluminium and is performing well within my oil catch tank system to allowing any oil that my vent from the engine to return via the oil cap. The part is also made from two pieces so this allows the top section to spin and be positioned where desired once the base is tightened, a very handy feature. Price is high but for something like this you do not have many options to choose from.
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