Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Welcome aboard from Denmark! 

Personally i find that thickwalled automotive silicone vacuum hose, works best for feeding orphan engines.

Something like this:
https://www.ebay.com/itm/332125050065

It is heatresistant, has great grip, and will stretch quite a bit to fit much larger tubing, than indicated by the inner diameter.