Outer Limits 4x4 Board

Hi have a long range tank from the 4runner i am parting out and wondering what brand the tank is? So i know what sort of capacity it has before i put it into the hilux
there are no markings to identify any brand.
also the small 2nd tank was attached but as can be seen the hose was worn out is this tank needed or can i just fit a breather?

Any help will be greatly appreciated.







Dave