This is the super 2-core version of the side radiator for 1992-on SPi models with the built-in electric fan switch. This version is unique in that the switch fitted is a custom one (C-ARA4445) that screws into the bottom instead of pushing in, to prevent accidental loss. Renowned super 2-core efficiency. All-copper construction. Ref: C-ARA4443.
This radiator version can be used in lieu of original-type side radiator GRD172.