25 Black Rubber Vacuum Caps for 3/8-Inch Diameter Review

These black rubber caps are perfect for sealing off unused ports in my car's fuel system. As my tests showed, they provide a tight, leak-free seal that holds up well against the demands of automotive use. The caps are easy to install and remove, and they fit snugly over the port without slipping or sliding off. The only downside is that they are a bit pricey compared to other options, but the peace of mind they provide is worth it. Overall, I highly recommend these rubber vacuum caps for any…

I bought this pack for the Eddlerock 500cfm carburetor vacuum line...it fits very well...and the material looks and feels high quality...I recommend it

rubber caps look pretty worn but look good enough to hold a pickup radiator. Use this to shut off one of the overflow pipes. I've done this before with a vacuum hose but it's a bit small and started tearing where it was pulled. I doubt it but will check the review again in case it gets damaged by the heat of the radiator.