Cracked crankcase breather tube on a Honda Reflex

[lux]

I was trying to service the crankcase breather on my 04 Reflex, and while trying to remove the plug it cracked. Now that I think about it I noticed a hairline crack before I started. I'm not really familiar with what its function is, or the consequences of the crack. In any case, I'd like to replace it. Where would I find a replacement? I'm assuming I could find the right size hose somewhere. Thanks for your help.