KPALAG Transmission Oil Fill Adapter for GM 8L90 — 304 Stainless Steel, 2 O-Rings

This precision-made adapter replaces DT-51190 and fits GM vehicles that use the 8L90 transmission, adding a durable, leak-resistant fill point where the factory design lacks an oil fill tube. Constructed from corrosion-resistant 304 stainless steel and supplied with two O-rings, the adapter supports quick-connect and direct hose filling so technicians and DIYers can control fluid volume precisely and reduce service time.

How does this adapter fit GM 8L90 transmissions?

The adapter threads into the transmission housing where manufacturers do not provide a dedicated fill tube, creating a secure fill port for the 8L90. It comes engineered to match the GM 8L90 interface and includes replacement O-rings to ensure a reliable seal during and after installation.

• Compatible with GM 8L90 8-speed transmissions and vehicles listed by model years.
• Replaces part DT-51190 for like-for-like fit.
• Includes two O-rings for immediate installation and spare use.

What connection options are available and why do they matter?

This adapter offers dual connection modes: a quick-connect fitting for rapid, tool-free attachment and a direct hose connection for manual pumps or funnels. The variety lets you use the adapter with professional Transflow equipment or simple hand pumps, improving flexibility for different service environments.

• Quick-connect for fast service bay use and reduced downtime.
• Direct hose connection for manual filling with pumps and funnels.
• Works with J-45096 Transflow for precision volume control.

How does the design prevent leaks and make installation easier?

The adapter uses high-grade 304 stainless steel for corrosion and temperature resistance and includes resilient O-rings to maintain a tight seal. Its dual-operation geometry — knurled hand-tight section plus hex wrench flats — allows quick hand installation or tool-applied torque when space is limited.

• 304 stainless resists rust, fluid exposure, and deformation over time.
• Knurled grip for hand-tightening; hex flats for wrench tightening.
• O-rings provide compression rebound and seal integrity during filling.

How does this adapter help achieve precise oil level control?

By providing a dedicated fill port and compatible quick-connects, the adapter enables controlled, measurable fluid delivery so you can reach the manufacturer’s specified oil level. It pairs with metered filling tools to avoid overfill and reduce the risk of leaks caused by imprecise topping.

• Allows metered filling with Transflow or pump systems for exact volumes.
• Prevents guesswork that can lead to overfilling or underfilling.
• Seals tightly to stop drips and fluid loss during service operations.

Who is this for: Technicians, independent shop owners and experienced DIY mechanics who service GM vehicles fitted with the 8L90 8-speed transmission will benefit from this part. If you need a robust, long-lasting fill interface that supports quick bay service and precise fluid control — and replaces DT-51190 — this adapter is designed for that role. The package includes the adapter and two O-rings, so it’s ready to install during routine transmission service or fluid changes.