Vacuum Switch Low Pressure For Enviro Empress Insert 50-1390 The vacuum switch is the stoves way of knowing it has an airflow through the venting in the proper direction. If the vacuum switch doesn't see a pressure difference it will not remain closed 100% Quality Assurance: Well-designed, well-crafted. This is the manufacturer's replacement and is functionally equivalent to the previous part Made of durable high quality materials. Compact and sturdy, built to last Easy to install, saving time and money. Super durable Please confirm that the model you need to buy matches our model before ordering After-sale guarantee: what we have been pursuing is customer satisfaction. If you are not satisfied with the product, please contact us! We will show you our sincere attitude and satisfactory solution