9kg. The blacktop however has all of the unwanted sections on the outer lip machined off to reduce the weigh at its most influential place. This minimizes the load right down to five.9Kg. Both are quickly interchangeable. See the final two photos to indicate the valve as it suits on https://paxtoncdcax.iyublog.com/28450119/not-known-facts-about-4age-for-sale