110x55 Squere Pipe End Cap

This end cap was designed specifically to be added on the ends of Squared pvc pipes like the one seen here (https://www.biltema.se/bygg/vvs/ventilation/ventilationssystem/ventilationssystem-110x55-mm-plast/ventilationskanal-110-x-55-mm-083-m-2000028236). When building a hydroponic gutter grow system / nft system using squared pipes (https://www.youtube.com/watch?v=RgeqURDWUos), you'll find that there does not exist a end cap for the pipe you are building with. When I was building the “H