Why should I use TopSan manifolds, instead of the Multiplex manifold?

The TopSan was developed to allow more than 4-ways to be used without having to spend time on screwing together more than one manifold – for example if you are supplying two bathrooms from one set of manifolds, needing an 7-way for the cold supply (2 toilets, 2 basins, 2 showers and 1 bath) and a 5-way for hot (no toilets). Using Multiplex you would need a 4-way + a 3-way, and for the hot supply you would need a 3-way plus a 2-way  – 2 more connections than you would have with a TopSan set of manifolds.