looking for heavy duty vacuum caps

seems as normal ones cant do the trick, i noticed two today that were completly torn on my intake manifold.

any suggestions?

andance auto sells some pretty thick ones. i have them with no issues

The thing about the advance ones is they are cheap chinese rubber that crack and fall apart usually in about 6-12 months. What size do you need, the tiny ones?

i’ve had them for over a year, no issues

Well the only thing I can say is don’t expect them to be reliable on a cooling system. I wound up just getting oem ones because they use good rubber and last a really long time.