GKTech Nissan S13 240sx Replacement Overflow Coolant Tank

The GKTech Replacement Overflow Coolant Tank for the S13 240SX, Silvia, and 180SX is a modern upgrade to the OEM plastic reservoir, which is often cracked, yellowed, or leaking after decades of use. Built from TIG-welded aluminum, this tank offers superior durability, better heat resistance, and a clean, race-ready look that elevates any engine bay.

This unit is a direct bolt-in replacement, mounting in the factory location and reusing your OEM coolant overflow hose. An integrated sight tube makes checking fluid levels easy, while the lightweight aluminum construction ensures long-lasting performance on the street or track.

Key Features:

• Direct OEM Replacement: Mounts in the stock location with no modification

• Durable Aluminum Construction: TIG-welded and built to handle extreme temps

• Sight Tube Included: Allows quick and accurate coolant level checks

• Cleans Up the Engine Bay: Sleek and simple design for a modern look

Specifications:

• Material: TIG-welded aluminum

• Finish: Raw or anodized (varies by batch)

• Install Time: ~15–30 minutes

Compatibility:

• Nissan S13 240SX (RWD)

• Nissan Silvia (S13 – RWD)

• Nissan 180SX (RWD)
  Fits OEM radiator support and accepts OEM-style hoses

What’s Included:

• (1) Overflow coolant tank

• (1) Pre-installed sight tube

• (1) Mounting hardware kit (if required)

Notes:

• Does not include hose – reuse your OEM or upgrade as needed

• Ideal for engine bay restoration, track prep, or daily driver refresh

• Pairs well with GKTech radiator cooling panels and fans

Replace that crusty OEM bottle with the GKTech Overflow Tank—a clean, functional upgrade built for form, function, and long-term durability.