Hot All In One No leak manifold for 7/8 PDF Print $21.60 You save: $5.40 SKU: GMM-238 All In One No leak manifold for 7/8" headers. Add to Wishlist Add to Compare Back to: Exhaust Systems Description Our New release. The All In One No leak Flange. No More Changing the Flange in order to run a Steel pipe as you can see you can run your Reg 7/8 Header or 7/8" Steel pipe. New Cap Diesigh for no more burn out Orings.