Since 1947 ZeeLine by Milton™ (formerly National Spencer) has been an American owned and operated company. From the beginning, we have been providing our customers with the best products for the ever changing Automotive, Commercial, Heavy Duty and Industrial markets. Within these four industries, our products service a wide array of markets that include automotive quick lubes, dealerships, fleets, commercial vehicle centers, agriculture, trucking, municipalities, railroad, marine, industrial and mining. Through the years we have provided innovative, efficient, high-quality solutions with exceptional customer service to support the aftermarket. Our customer service and technical team are based in Wichita, Kansas and our distribution center is in Spencer, Iowa for quick efficient service.

In July 2021 National Spencer and the ZeeLine brand was acquired by Milton Industries, Inc.®

At Milton® Industries our core values drive our business, we passionately believe we must partner with our customers, listen to their needs, and supply solutions that enable them to succeed. For the past 79 years, Milton® has been the product of choice when it comes to pneumatic accessories. Our portfolio has grown to over 2500 different SKU’s. These products cover a broad range of applications in various industries, such as automotive, aerospace, fleet maintenance, construction, agriculture, and manufacturing.


With roots reaching back decades, Milton® and ZEELINE are well-known names in the fluid management industry.