If you are looking for a no leak v-band, sorry they don't make them. But, we have the alternative that's been LEAK free since the 40's. They are called Marman Flanges. We make them in 2 1/2" - 3" in steel, aluminized steel, 409 stainless and 304 stainless. Visit GBEMANDREL.COM or for better service/prices, please call us at 503.344.4149 We ARE the manufacturer, not a wholesaler who just buys parts to sell for a profit!