This Avantco 17812021 pan rail lid is a direct replacement for the one that came standard on SSPPT-2 prep refrigerators. The lid is a vital part of the pan rail assembly, ensuring that cold air is locked in and hot air is locked out. This helps to regulate the temperature within food safe holding standards while also saving energy and letting your unit's refrigeration system run more efficiently. If it's broken or worn out, be sure to replace it promptly.