Midland Manufacturing, part of OPW,  a Dover Company is a leader in the rail tank car valves and fittings industry.  Our innovative rail products are manufactured and engineered for the safe and efficient loading, transporting, and unloading of hazardous and non-hazardous bulk products.

For over 125 years, OPW has led the way in designing and manufacturing world-class retail fueling, fluid handling and car wash system solutions for the safe and efficient handling and distribution of fuels and critical fluids. OPW makes above ground and below ground products for both conventional, vapour recovery and clean energy applications in the retail and commercial markets. Additionally, OPW supplies loading arms, valves and dry-break couplings, tank truck equipment, rail car valves and equipment, and car wash systems. OPW has manufacturing operations in North America, Europe, Latin America and Asia Pacific, with sales offic...