The Duravent chimney pipes are typically meant to attach to a Duravent anchor plate or combine with other Duravent chimney extensions so not sure if it would work with that existing chimney pipe. We do carry chimney extensions that fit the Portuguese Brick ovens from the brand Authentic Pizza Ovens.
Click here for the link: https://www.patioandpizza.com/products/stainless-steel-chimney-extension-apo?variant=12462972829801
