Cobb Subaru EJ TGV Shaft Seal Kit - 2015-2021 Subaru STI

The COBB TGV Shaft Seal Kit is a simple, effective fix for one of the more annoying leaks that can develop on late-model EJ-powered Subarus. Over time, the Tumble Generator Valves (TGVs) can begin leaking from the end opposite the motor/sensor assembly. In the past, addressing that leak could be tedious and expensive. COBB’s solution makes it far easier to fix in your own garage.

This kit includes two black anodized billet aluminum plates, one for each TGV, along with matching O-rings to create a proper seal at the housing. It is a clean, durable solution that helps eliminate those pesky leaks without unnecessary hassle.

Key Features

• Solves Common TGV Leaks: Designed to address leaks at the end of the TGV housing opposite the motor/sensor.
• Billet Aluminum Construction: Durable aluminum plates built for long-term reliability.
• Black Anodized Finish: Clean, corrosion-resistant finish.
• Laser Etched COBB Logos: Premium finishing detail on each plate.
• Complete for Both Sides: Includes two plates and two O-rings, one for each TGV.
• Garage-Friendly Fix: More affordable and approachable than traditional repair methods.

Why We Like It

This is a classic “small part, big payoff” fix. Instead of chasing a frustrating leak or spending more than necessary, this kit gives STI owners a clean, proven solution that is easy to justify while working on the intake side of the engine.

Confirmed Fitment

• 2015–2021 Subaru STI

Specifications

• Material: Billet aluminum
• Finish: Black anodized
• Branding: Laser etched COBB logos
• Seal Type: O-ring sealed

What’s in the Box

• (2) Black anodized billet aluminum TGV shaft seal plates
• (2) O-rings

Installation Notes

For Cobb Tuning's OfficalInstall Instructions, please click here.

• Installs on the end of the TGV housing opposite the combined sensor/motor assembly.
• Recommended to inspect sealing surfaces and clean thoroughly before installation.
• A great service item while addressing intake or TGV-related maintenance.

Emissions

50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer’s application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number:

• D-660-236

Compatibility & Disclaimers

Designed for 2015–2021 Subaru STI applications using the late-model EJ TGV housing design described above. Always verify fitment before installation and follow COBB’s application guide.