This fuel vapor valve and grommet are necessary to install gas tank number D7DZ-9002C in a 1971–75 Maverick, because the emission hole in the original tank was larger than the hole in the D7DZ-9002C tank. Also, if you are installing D7DZ-9002C in a 1976–77 Maverick, you may want to purchase this fuel vapor valve and grommet, because they are very difficult to remove from the old tank without being damaged.
For grommet only, see part number F6TZ-9B076AA.