ENPRESS manufactures the world's finest composite pressure vessels and water treatment equipment, 100% Made in the USA. We utilize an industry exclusive copolymer polypropylene formulation for the liner assembly that is far superior to traditional polyethylene. That means ENPRESS vessels provide superior performance in harsh climate extremes and have far better chemical and impact resistance. But you get more than a great vessel from us. You get a great team with over 75 years combined engineering, manufacturing and marketing experience in the field. ENPRESS - Where Innovation Flows. ENPRESS LLC is a worldwide leading manufacturer of composite pressure vessels for use in water treatment. ENPRESS tanks are manufactured with an industry exclusive liner design and formulation that offer superior benefits and features...100% Made in the USA. More information is available on the companys website at www.enpress.com or by calling l-866-859-9274.