StormDrain FSD-3017-20SKIT-6 20-in. Round Catch Basin Drain with Solid Lid Kit

If you notice in the picture the housing on the left accepts 2-4” pvc, the housing on the right accepts 6” pvc. Notice the length of threads. The problem with the left housing is after you’ve installed the locknut onto the housing and have cut out the right size hole for the pvc that you’re going to install, when you push the pvc through the hole the locknut comes off because the threads are too short. If you’re going to use this for 2”-4” my suggestion would be to use a male adapter with a locknut on the inside, of course you’re going to have to buy a hole saw just the right size for the male adapter, but it’s better than sliding the pipe through and having the locknut come off after you’ve already glue it. Hopefully the company that makes this will read this comment and make the threads about a 1/2” longer.