Viega MANABLOC is the first parallel water system to incorporate PEX distribution lines to individual plumbing fixtures. The single source for PEX tubing, manifolds and fittings, Viega MANABLOC provides everything you need for a complete plumbing system. Fewer fittings behind the wall reduce chance for leaks. Decreases wait time for hot water. Reduces water waste and saves energy. Qualifies for LEED points. Real 10-year transferable warranty on the system.