Wessels is a manufacturer of ASME certified and non-ASME certified pressure vessels for commercial and industrial fluid control applications. Products produced and marketed by Wessels are used in chilled or hot water HVAC systems to control or handle fluid under pressure.

In most cases, the Company's products are designed using a flexible bladder or diaphragm inside a pre-pressurized vessel to maintain the separation of air and water in the vessel. Certain products offered by the Company include hydro-pneumatic tanks, pressure booster system tanks, expansion tanks, thermal expansion tanks, flash tanks, air separators, glass lined water tanks and other specialty and custom tanks including glycol makeup packages.

The Company's tanks are offered in sizes ranging from 2 to 4,000 gallons. Wessels has one of the broadest product offerings in the HVAC pressure vessel market and is recognized by its commercial and industrial customers for manufacturing tanks that are of the highest quality. Sales are made worldwide.