This 3MI Racing hose adapter is a must - have for installing IAG Street, IAG Comp, Cobb, and Crawford AOS systems on Subaru EJ engines. It smoothly connects the 7/8 - inch block outlet to the 5/8 - inch vent hose when using the 3MI Racing AOS to EJ drain hose. It's the simplest way to make these AOS systems work with the 3MI drain hose, which can be bought separately. The barb replaces the 'Y' fitting in the AOS kits. Connect the AOS drain barb to the 1/2 portion of the 3MI Racing drain hose, and the 5/8 hose goes straight into the top of the center block vent. The adapter converts the hose size from 5/8 to 7/8. Made of 6061 - T6 material, it features a 7/8 to 5/8 male - to - male barb fitting.
How to use: First, remove the 'Y' fitting that comes with your AOS kit. Then, connect the AOS drain barb (at the bottom of the can) to the 1/2 portion of the 3MI Racing drain hose. Next, take the 5/8 hose (the lowest and largest port on the side of the AOS can for IAG kits) and insert it directly into the top of the center block vent. The 3MI adapter will convert the hose size from 5/8 to 7/8. Notes: Make sure all connections are tight to prevent leaks. Check the fitting regularly for any signs of wear. Maintenance: Clean the adapter periodically with a mild detergent and dry it thoroughly. Store it in a cool, dry place when not in use.
