Lincoln OEM Large Vented Fuel Gas Cap For Plastic Tanks Only SAE 300 400 500 & More
Lincoln OEM Vented Fuel Cap 9SS20541, newer style!
Fits SAE 300,400,500 with plastic/composite tanks.
Also, fits Air Vantage, Classic, Commander and Rangers that have large vented caps AND composite tanks.
The neck of your tank should be about 3-1/2" diameter measured to outside of threads.
This cap has an overall Outside of 4-1/4" with 3-1/2" threads on inside.
NOT FOR STEEL TANKS! Make sure you need THIS CAP! NO RETURNS!