radon pipe leak

https://radonmanometerreadingdesk.birchreport.com/posts/how-to-read-a-radon-manometer-reading-for-your-mitigation-system

We noticed a faint smell in the basement and called a contractor, who found a small leak where the radon pipe connects to the sump pit. He sealed the joint with special caulk and installed a manometer to monitor pressure in the pipe, since even tiny leaks can let the gas build up inside the house and increase lung cancer risk over time.