https://news.ycombinator.com/item?id=38427231 https://news.ycombinator.com/item?id=38427231 In 2019 at least 12, and earlier this year at least one updated des

https://news.ycombinator.com/item?id=38427231 https://news.ycombinator.com/item?id=38427231 In 2019 at least 12, and earlier this year at least one updated design requiring minimal pipe maintenance.