Laars Lite 2 400K Heater - Siphon Loop Tube Leak

I have a Laars Lite LD400N heater - 14 years old.  The siphon tube that connects the pressure switch to the header sprung a leak.  It is a simple connection to each side with brass compression fittings.  Can I just get copper tubing and fittings from Pep Boys and replace it?  The online price is about $50 for a $10 part.

Yes or brake line tubing will work each end have flared fiitings.