Hello. Re Webasto marine heater Fuel Filter upgrade | 4110766A - will the hose tails fit 5mm ID fuel hose please ?

Hello, Thank you for your question about the marine fuel filter for diesel heaters. Yes if you fit a marine grade rubber hose ISO 7840 Part number (4158400) to the fuel filter tails you will need 5mm ID, if you are using copper pipe you will need 5mm OD with an ID of 2mm please see the part number (41S45009A) for reference. If you have any further questions please contact us on sales@butlertechnik.com