Quote Originally Posted by BamaNomad View Post
C3 Corvettes used a check valve in the vacuum circuits that raised the headlights and WSW door. It is an inline check valve, available at Corvette Central and other fine Corvette dealers.. ...

https://www.corvettecentral.com/c3-6...dcheck%2bvalve
I found the original type one. It's a molded hose with a valve inserted inside it like a suppository. Curious though, do you know what size hose fits the vet one? This is my first Subaru, funny 4 cylinder engine with the pistons going straight out left and right, 2 on each side.