Hello guys, First post to TIJ I got a question on if attached plastic corrugated tubing in compliance with Code such as IPC, UPC. From my understanding, such corrugated design will accumulate dirt and will be clogged in long term. So I am thinking it was in conflict with UPC 310.5 I also see some copper corrugated tubing in the market. would like to see others opinion on such corrugated tubing. Click to Enlarge 17.62 KB