Recirculating catch can for radiator

What's everyone using for a recirculating catch can for a radiator? I have an overflow, but want a true recirculating can.

Rather not have to top it off once it cools down...

John,

I use a sealed aluminum catch can with a tube inside that is about 25mm from the floor.

I've used the black plastic one (Moroso) and added a tube inside to go to the bottom, as was described. No more topping off.

pmrphil wrote:I've used the black plastic one (Moroso) and added a tube inside to go to the bottom, as was described. No more topping off.

The "street rod" crowd usually re-purposes something O.E.M.