Direction of check valve?

I can't see your photo -- for some reason it did not upload (you must be using a POS apple product ).

To answer your question though, the arrow always points along the direction of positive air flow.......so, the arrow should point into the path leading into the plenum.

 

That little plastic valve is ridiculously priced. The black one for Peugots is readily available. I myself bought a really nice metal one for MBs from Pelican Parts for about 35 bucks. Much better made. What is available is easily searched via Google. Good luck.

 

Arrow points toward tee (and the check valves) -- in the direction of the airflow.

PS This item is more often referred to as the "air injection cutoff valve" in the F documentation as its state is controllable by another (vacuum) signal. "Check valves" are more usually passive (uncontrollable) devices.

The first part of your statement is correct (the arrow always points along the direction of positive air flow), but you misread his original post -- there is no (large) hose going from this component into the plenum -- the hose (from the airfilter box -- which is the air source) just runs UNDER the plenum.

 

Yep, thanks Steve

I did not read his post carefully enough My bad.....

 

I don't know of anything offhand (and, if you want to go "plastic", it will need to be, at least, a fairly high-temp tolerant nylon material if not something more exotic). Don't know why that 109887 part price has gotten so far out of whack -- post #10 in this thread shows a (hardware store) brass piece that another Owner successfully substituted:

http://www.ferrarichat.com/forum/showthread.php?t=261833&highlight=109887&page=3

 

If you don't mind the way it looks, you can just wrap it with some foil tape / fiberglass cloth / (or even teflon tape) for a heat shield. I've got a lot of plumbing wrapped up on my cars . It's a very economical way to protect $$$$ stuff.