... aluminium plate fins (Cu/Al) Distance between fins: VS-10÷15 - 2,1mm VS-21÷650 - 2,5mmFin thickness: 0,1mm (Al ... ) Pipe wall thickness: 0,37mm Pipe diameter: VS-10÷15 3 ... /8" VS-21÷650 1/2Collector diameter: VSDNMaterialConnection10,1520brassthread R3 ...