Product Focus: Radiant Heating Systems Issue: 9/01 Twistlink, the mini modular radiant heating manifold, is targeted as a solution for very basic systems, such as garage floors, basements and floor warming, where flow balancing and precise control is not required. The Twistlink mini manifold features a modular design with supply and return module pairs; plastic construction; full flow; 3/4" supply end connections; supply shut-offs; and interchangeable pipe to manifold connecters in 3/8", 1/2", and 5/8". The mini supply module provides on/off manual control to allow isolation of individual loops and can be assembled into groups of up to five pairs. Heatlink.