CSF Aluminum Filler Neck with High Pressure Radiator Cap — BRZ / 86 / GR86

Replaces the factory plastic filler neck on the BRZ/86 platform with a machined aluminum unit, supplied with a high-pressure radiator cap.

The OEM plastic filler neck is a known failure point on this chassis — it becomes brittle with heat cycling and can crack without warning, dumping coolant.

Fits 2013+ BRZ, 2013–2020 Toyota 86, and 2022+ GR86.