This Power Steering Adapter fits various power steering applications with 9/16 - 18 ports. The adapter includes a crush washer and Teflon o-ring to seal the adapter to the port. A machined or spot-faced surface approximately .120" wide is required around the opening of the ports to ensure a positive seal, Crush washer and o-ring can be removed for applications where the ports contains an inverted flare cone. Zinc plated steel. Made in USA.