RZ/RD 350 & Misc. 2-Stroke Tech BBS

I have an RZ gas tank (I think) , but it has a hose barb on the underside , almost central. My other RZs don't have this. Any ideas ??

That is a California fuel tank. That fitting plumbs to the charcoal canister. I have a few of these.

Yes, I'll 2nd that for you, It's a California emissions factory modification.
Back then, models were 49 state, then we had our special versions..lol
Now if I'm not mistaken? (All cars) and motorcycles sold in the U.S. in any state must meet California compliance/standards.

Thanks for the info