EXTENSION HOUSING O-RING

The Coan Racing COA‑12165 Extension Housing O‑Ring is a precision seal designed specifically for GM Powerglide transmissions. Engineered to sit within the extension housing interface, this O‑ring delivers a snug, leak-free seal, maintaining critical hydraulic integrity under high-pressure operating conditions. Crafted from durable material and tailored to match factory specifications, it withstands thermal expansion and fluid exposure to ensure long-term sealing performance.

Ideal for both routine rebuilds and performance-focused builds, the COA‑12165 provides reliable protection against fluid loss, preserving consistent pressure and the overall health of your Powerglide transmission.