This is RIB Functional Devices RIB2421B 20A Resistive/277 Vac used  part. 

This part was removed by HVAC installer from a fully functioning system. 

Part is in good used condition.

Please learn more details from the images attached. 

I am offering a FREE USPS First Class mail delivery and 30 days FREE returns. 

My handling time is 1 business day only. 

Purchasing used parts you agree with the statement that sometimes hidden defects or malfunctions may occur during installation or continuous use. There is no warranty on used parts. But you have 30 days satisfaction guarantee and 30 days FREE returns!

 Most of the parts require specific knowledge and skills to be installed properly. If you don’t have skills or knowledge, you must ask certified HVAC technician to install. I am not liable for any damages or failures as a result of improper installation.