New hybrid design fits control tower and toro mini xl /common slurps. The fitted sections are 9.50mm and 14.65mm respectively. This piece is so closely fitted that it becomes virtually inpossible for it accidentally fall off the banger. Its design as a hollow vaccum makes it a feat of engineering and brings several advantages while in use. This cap has the benefit of being so light that in the rare instance of a mishap it will be much less likely to damage your banger than other heavier options.