Product Description Viega PureFlow provides the industry's most comprehensive selection of PEX tubing, fittings and accessories. Along with a wide variety of PEX fittings, which include both PEX Press and PEX Crimp, Viega also offers the patented MANABLOC water distribution system which helps homeowners realize a reduction in water waste and increased energy savings. From the Manufacturer Viega PureFlow provides the industry's most comprehensive selection of PEX tubing, fittings and accessories. Along with a wide variety of PEX fittings, which include both PEX Press and PEX Crimp, Viega also offers the patented MANABLOC water distribution system which helps homeowners realize a reduction in water waste and increased energy savings.