Overfill limiting valve
See page 25-15 of the '72 Plymouth Chassis manual which you can download, free from MyMopar. That manual, as well as several others "over there" came from the guys here at FABO. That one thanks to AbodyJoe
If you are unfamiliar with what they are calling "inches of water pressure" this is exactly what it says........measured in inches of rise in a column of water, otherwise known as a manometer
See page 25-15 of the '72 Plymouth Chassis manual which you can download, free from MyMopar. That manual, as well as several others "over there" came from the guys here at FABO. That one thanks to AbodyJoe
If you are unfamiliar with what they are calling "inches of water pressure" this is exactly what it says........measured in inches of rise in a column of water, otherwise known as a manometer