This sump pump kit includes the Liberty 237 sump pump, with a 3 year warranty, and the Radon approved sump basin. The sump is plumbed to, and includes, the check valve. It has a 3" vent hole in the lid for venting Radon gas and crawl space odors outdoors and a 1 1/2" water discharge. Ready to install per the manufacture requirements. This basin is 18" wide and 17" deep capable of holding 15...