1968 Stant Lev-R-Vent Radiator Cap

59 This wa originaly bought for restoring a car. Since that didnt happen my mechanic just tried it on the Jeep, as the Jeep radiator cap was not in good condition. Somehow this fits the Jeep raditor.
"A tab on the bottom of the lever interlocks with the filler neck to prevent removal of the cap until the lever is lifted. When the lever is lifted, the entire pressure valve is lifted off the lower sealing seat in the filler neck, harmlessly venting pressure through the overflow tube. " - Source www.stant.com