NOT A VERY OLD  UNIT (Produced in 2019-2020 OR NEWER  Units have been tested and confirmed functioning using the Hayward Official Cell Tester Controller Box 

Hayward TCELL940 40K gallon replacement for T-Cell-15 Extended Life Replacement Salt Chlorinator Cell is a top-of-the-line product for your pool's salt chlorinator needs. The cell has been designed to provide extended life and reliable performance. It is compatible with various brands and types of salt chlorinators, making it a versatile option for your pool. Cell Only.