Typically, I would recommend if it is close to the stoma &amp; if you are using a flat type of product/wafer, what I would do is cut a hole for your stoma, you might have to get a bigger flange for it, but cut a hole for your stoma &amp; cut a little hole where the fistula is so that <a title="Drainage Bags" href="https://www.healthproductsforyou.com/c-drainage-bags.html" target="_blank"><span style="font-weight: bold;">drainage</span></a> from both stoma &amp; fistula will empty into that bag. If there is not enough space in the wafer, they actually make fistula pouching systems in various sizes that you can incorporate, you can get those without any holes so it is easier to maneuver &amp; get the geographic locations correct in both of your openings but I would have them draining into the same bag.