Ford C6 push-in type modulator with o-ring (new), and adjustable! Offering a new Purple Stripe Push-In Style Vacuum Modulator. For C6 Transmissions on cars and trucks from 1973 – 1996. Replaces Ford # D5AZ-7A377-A. Made by Rostra Precision Controls in the USA. For use on gasoline engines (Not recommended for Diesel Applications). NOTE: PURPLE STRIPE MODULATORS CAN LOWER LINE PRESSURE ENOUGH THAT ON SOME TRUCK APPLICATIONS THEY WILL END UP WITH A CHATTER OR SHUTTER WHILE ENGAGING IN REVERSE.