Alternative G4 replacement filter set, suitable for Helios KWL EC 270/370 with bypass ELF-KWL 270/370 4/4 BP 09613 and 09617 : Amazon.co.uk: Garden & Outdoors
Filter media CT 15/150 on roll 40 m² | G3 | With a discount up to 20%! - KWL -FilterOnline
XCMG XCMG-KWL-030D01 Main filter element 800159694, MACHMALL
KWL Filter Store - Photos | Facebook
Ersatzfilter G4 Filter für Helios KWL EC 200 / EC 300 ECO PRO Lüftung RLT WRG | eBay