For Bus/Bug - This all aluminum radiator filler is used for the Type 1 and Type 2 Subaru engine conversions. In a bus it is used with dual engine bay radiators and is placed in the VW Scirocco radiator that sits on the drivers side, allowing coolant to be filled from the engine hatch (Late Bay engine hatch). This makes for a clean installation without drilling an additional hole in the cargo area of your bus. For Early Bay with no hatch you'll have to create an access port.
For the Beetle/Bug/Type 1, use this filler in a front radiator design to make for convenient filling of the Scirocco radiator.
The stock Subaru radiator cap is recommended for use with this filler.
Video explanation here: https://youtu.be/d7N0P4NK-Tk
You can see this filler in action here: https://youtu.be/dTdz6FhRrt4
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