ACDelco Professional RC6 13 P.S.I. Radiator Cap

As stated in previous reviews this cap has metal sealing surface and not rubber but it works great I had my doubts when I installed the cap but it works as advertised I would buy again. Used on small block Chevy with Champion 4 row/core radiator

I'm mainly writing this review to let people know that this cap does NOT have an upper seal. It has an embossed metal disc instead of a traditional rubber seal. I was skeptical at first but it seals great. It is a little harder to remove due to the stronger spring on the upper seal.

According to the measurements shown on the display page this was supposed to be "Product Dimensions 2.5 x 2.4 x 1.5 inches". The height is NOT 1.5 inches. It is hardly over 1 inch high. It will have to be returned.

Great product !!!