Overflow bottle

I'm using this one. Works pretty well..

[ame="http://www.ebay.com/itm/Weapon-R-826-134-101-Aluminum-Coolant-Overflow-Reverse-Tank-24-fl-oz-Universal-/310863514764?pt=Motors_Car_Truck_Parts_Accessories&hash=item4860e8cc8c&vxp=mtr"]Weapon R 826 134 101 Aluminum Coolant Overflow Reverse Tank 24 FL oz Universal | eBay[/ame]

Just have to buff their logo off the top...