Koyo Aluminum Coolant Filler Neck

Universal Fitment

Part #: FN2320

Overview

The Koyorad Aluminum Coolant Filler Neck is a high-quality upgrade designed for the 2013-2020 Scion FR-S and Toyota 86. Crafted from durable aluminum, this component replaces the stock plastic filler neck, offering enhanced durability and a sleek, performance-oriented appearance. It is ideal for enthusiasts seeking a reliable, corrosion-resistant part that supports optimal cooling system function and adds a refined touch to their engine bay. Whether you're restoring your vehicle or upgrading for improved longevity, this filler neck provides a significant upgrade over OEM plastic parts, ensuring consistent performance and a clean aesthetic.

Key Features

This aluminum coolant filler neck features a thoughtful design focused on durability and functionality. Made from high-grade aluminum, it resists corrosion and heat-related wear, extending the lifespan of your cooling system. The integrated 1/8 PT sensor port allows easy installation of temperature sensors, compatible with most Japanese gauge systems, providing accurate monitoring of coolant temperature. The conversion to a deep plunger radiator cap style (compatible with Koyorad #SK-C13 or equivalent) offers increased durability and a more secure seal compared to OEM caps. The design also includes features that facilitate straightforward installation and a seamless fit within the engine bay, helping maintain the integrity of your cooling system.

Construction & Design

The filler neck is constructed from lightweight, corrosion-resistant aluminum, machined to precise specifications for a perfect fit. Its integrated sensor port is designed for easy sensor installation and reliable operation, supporting accurate temperature readings. The deep plunger radiator cap conversion enhances durability and sealing performance, reducing the risk of leaks and pressure loss.

Installation & Fitment

Designed for direct replacement on the 2013-2020 Scion FR-S and Toyota 86, this filler neck requires standard mechanical skills for installation. Proper fitment should be verified against your vehicle’s specific configuration and part compatibility. The process involves removing the stock plastic piece and installing the aluminum upgrade, ensuring a secure and leak-free connection.

What’s Included

The package includes the all-aluminum coolant filler neck with the integrated sensor port and the necessary hardware for installation. The optional plug for the sensor port is also supplied, allowing customization based on your sensor setup.