Serie GMA410 is a hydraulik separation to separate heating circuit from heating source. Series GMA420/430/440/450 are manifolds for circulation units. The manifolds are available for 2, 3 and on request for 4 and 5 heating circuits. 
Series GMA500 are manifolds with integrated hydraulic separation for 2 and 3 heating circuits.

ESBE | GMA400, GMA500, Manifold