Fitede Automatic Transmission Filter & Oil Pan Gasket Kit — FB25BA/FA20F/TR690 Fit, OEM-Equivalent, 12-Month Warranty

Fitede's FB25BA FA20F TR690 kit is a direct-fit automatic transmission filter and oil pan gasket set engineered to trap contaminants and restore a clean fluid path for compatible Subaru gearboxes.

This kit contains a replacement transmission filter and a new oil pan gasket manufactured to meet or exceed OEM quality standards and tested 100% before shipment. It’s designed specifically for Subaru gearboxes using the FB25BA, FA20F or TR690 transmission families and swaps directly for part numbers 31728-AA121 and 31728-AA120. The components are molded from durable materials to help keep transmission fluid free of particles that can restrict valve body passages and accelerate wear.

Which Subaru models will this transmission filter and gasket fit?

The Fitede kit is compatible with multiple Subaru models that use the FB25BA, FA20F or TR690 gearbox. Always verify your vehicle’s OEM part number before ordering to guarantee fitment.

• 2015 WRX STI
• 2015–2021 WRX
• 2010–2019 Outback
• 2010–2019 Legacy
• 2015–2019 Impreza
• 2010–2018 Forester

What parts are included and what are their roles?

The package contains a single automatic transmission filter and one oil pan gasket. The filter captures metal shavings and debris while the gasket seals the pan to prevent leaks and preserve correct fluid pressure.

• 1 x automatic transmission filter — traps contaminants and supports steady fluid flow
• 1 x oil pan gasket — provides a leak-free seal between pan and transmission housing

How does this kit compare to the original equipment parts?

Fitede produces the kit to meet or exceed OEM quality benchmarks and performs full testing prior to dispatch. Materials and manufacturing processes are chosen to align with factory tolerances and durability expectations.

• Replaces OEM numbers: 31728-AA121, 31728-AA120
• 100% tested before leaving the factory for functional reliability
• Manufactured from high-quality materials to match service life expectations

What warranty and support come with the kit?

The kit is backed by a 12-month warranty and a hassle-free return and refund policy, offering confidence when purchasing and installing the parts yourself or via a shop.

• 12 months warranty coverage
• Hassle-free return and refund policy
• Recommended to confirm OEM part number before purchase

Who this is for: This Fitede transmission filter and oil pan gasket kit is intended for owners and technicians working on Subaru models that use FB25BA, FA20F or TR690 transmissions who need OEM-equivalent replacement parts. It’s a practical choice for routine transmission maintenance, fluid service, or when replacing a leaking pan gasket, provided you confirm the listed OEM part numbers match your vehicle.