> Does anyone offhand know what the black outside/blue inside hose that
> connects the brake fluid reservoir to the clutch master cylinder is made out
> of?
>

Answering my own question for the benefit of others who might need to know:
clutch line is fed with a nylon braid reinforced blue EPDM hose. This is
important because most hose materials are incompatible with brake fluid, and
EPDM brake hose is incompatible with gasoline, oil, and ATF.

I also found an interesting "O-ring compatibility" chart that lists several
of the most commonly rubber-like materials and their suitability for use
with various substances:

<http://www.allorings.com/compatibility.htm>

Now to see if I can fit a level sensor to a late bug brake fluid
reservoir...

--
John Bange