significantly extending the service life of the tank lining in harsh water conditions

and the necessary sealing surface components for the B1 frame

Versatile Compatibility: Ideal for refrigeration merchandisers

the 20415901 is the official superseding part number for the 20415501

these are the same factory part number

International Environmental 71520319 Thermostat Refrigerant significantly extending the service lifeThe International Environmental 71520319 is an OEM 7 day programmable fan coil thermostat designed for precision climate control in high performance hydronic systems. As a veteran grade digital thermostat replacement for the obsolete 71520305, this unit offers seamless integration into existing 2 pipe or 4 pipe fan coil configurations without requiring backplate modifications in most retrofit scenarios. High volume fan coil unit parts like this are