Click to expand Tap to zoom 66000500: ESBE GMA321 Manifold for Pump Group by ESBE SKU 66000500 ESBE GMA321 Insulation shell according to EnEV2014 standard Made for the circulation units DN20 Easy installation with included wall brackets Series GMA320 is manifolds for 2 circulation units and Series GMA330 is manifolds for 3 circulation units including insulation according to EnEV2014 and wall brackets. ESBE | GMA300, Manifold Accessories