The copper line is 3/8.   The fittings are 3/8 flare fittings.  The
nut size is 13/16 inch.
(Propane system parts are American sizes, not Metric)

Every Home Depot I've been to sells the flare fittings.  Find the
wall of little parts in little plastic bags in the plumbing section.

----

That being said, I do like Marks idea of using a flexible hose (near
the gas stove, hot water tank installation parts at Home Depot).

Easier to install than cutting/bending/flaring semi rigid copper tubing.

>What is the size of the propane lines that go to the regulator and where do
>I get fittings?   One of mine is cracked from the bend due to the longer
>regulator and I want to repair it.  Home Despot does not have anything close
>to the size.
>
>Thanks
>Tom Salicos
>'87 Syncro Westy EG-33