What is the purpose of the 1/8 NPT sensor port?

The integrated 1/8 NPT port allows you to install aftermarket sensors, such as temperature or pressure sensors, to monitor your cooling system. A plug is included if you do not plan to use this feature.

How difficult is it to install this filler neck?

Installation is designed to be a simple drop-in replacement with no modifications required. It typically takes less than five minutes to swap out the stock plastic filler neck for this aluminum version.

Can I use a different radiator cap with this filler neck?

Yes, the included 'mini style' radiator cap is designed to be easily replaced with other aftermarket caps if you wish to use a different brand or pressure rating.

2013-2025 Subaru BRZ Aluminum Filler Neck | CSF 8044

Name: CSF 13+ BRZ / 13-20 Toyota 86 / 22+ GR86 Aluminum Filler Neck w/ High Pressure Radiator Cap
Brand: CSF
Price: 139.00 USD
Availability: InStock

CSF 13+ BRZ / 13-20 Toyota 86 / 22+ GR86 Aluminum Filler Neck w/ High Pressure Radiator Cap

$139.00

On Backorder — Expected to ship by Jul 9, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2013-2025 Subaru BRZ. This aluminum filler neck replaces the stock plastic one and includes a 1.4 bar high-pressure cap.

Key Features

Fits 2013-2025 Subaru BRZ, 2013-2016 Scion FR-S, 2017-2020 Toyota 86, and 2022-2023 Toyota GR86.
All-aluminum construction with 100% TIG-welded seams.
Includes a 1.4 bar high-pressure radiator cap with a 'mini style' design.
Mirror polished finish for a clean appearance.
Features an integrated 1/8 NPT sensor port with a pre-installed plug for optional aftermarket sensors.

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Will this fit your vehicle?

Product Details

This kit gives you an all-aluminum auxiliary filler neck, a 1.4 bar high-pressure radiator cap with a "mini style" design, and a pre-installed plug for an optional 1/8 NPT sensor port. It's designed to replace the weaker plastic filler neck found on your Scion FR-S, Subaru BRZ, Toyota 86, or Toyota GR86.

CSF builds this filler neck from aluminum and welds it completely using TIG for a solid construction. It's then mirror polished for a clean look. The included 1.4 bar cap is a high-pressure unit, which can help maintain optimal cooling system pressure. The cap is designed to accept aftermarket replacements if you ever choose to swap it out, and the filler neck itself has a built-in 1/8 NPT port for adding aftermarket sensors, with a plug included if you don't need it.

Installation is straightforward, as this part is made to be a direct drop-in replacement. You shouldn't need any modifications to get it installed, and it typically takes less than five minutes to swap out the old plastic neck for this upgraded aluminum version.