I bought some of this when I was struggling to find OEM replacements for my petrol 940. I didn’t use it in the end because it transpired the leak wasn’t from the heater hoses but instead from the oil cooler coolant pipes. It seemed pretty heavy duty and a reasonable price but I think it would have been a pain to fit given the inaccessible location of the heater pipework on a petrol 940.
https://www.ebay.co.uk/itm/Flexible-...e/353349957331