Note this is a screw threaded PCV, used on many 1966 & 1967 GM / Chev V8's, and…
Fuel Filler neck rubber insulator used on most mid to late 60's and GM E & C bodies to around…
1968-70 (3/8 tube w/ vent line) MOST.. non US Emission states.. first sold had SINGLE line FTSU's .. not…