Twist n' Lock Pump Assembly The intuitive simple to use Twist Lock handle works by locking the redesigned piston assembly into place helping to prevent back flow of any waste water into the bowl. Base valve gasket is included. Compatible Devices: * 29090 Series * 29120 Series Warning [https://productimageserver.com/prop65/6pt.png]WARNING: This product can expose you to chemicals including ANTIMONY OXIDE (ANTIMONY TRIOXIDE) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov [http://P65Warnings.ca.gov].