Protec Arisawa, part of the Arisawa Group (Japan), is the global leader in the design and manufacture of fiberglass reinforced plastic (FRP) pressure vessels for membrane filtration systems. Over 40 years of filament winding experience with three production sites on three continents and a global sales network. Products include standard and custom-size pressure vessels, center port vessels and spare parts for RO, NF, UF and MF membrane treatment projects. Vessels designed to ASME Boiler and Pressure Vessel Code Section X, available with ASME Code Stamp.