511-624-510 for WEIL MCLAIN Pressure Differential Switch FS-4080-132 100% 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