I went and bought a brand new oem mazda Air check valve today and it's not identicle to the original one. anyways, half of it is white and half of it is green and there's an arrow pointing in the direction of the green half. I've attached 2 rubber lines to either end but not sure which coloured end goes where. So simply my question is, the arrow that's pointing do i install it pointing to the line that goes to the diaphragm or to the line that goes to the back of the TB (located between tb/intake mani and the firewall.

 

The direction that has the arrow if I recall is the way it flows air ( can be checked by blowing). Depending on your car it might be pointing towards the TB (vacuum line) or away (pressure line). Check the hose diagram to indicate which.

 

http://www.teamfc3s.org/main/factory...SYSTEMS_NA.pdf

I checked this and page 4A-5 is the best i came up with, it still doesn't help. I know where it connects/plugs to, just don't know which end goes where. This check valve isn't the one you or most of you have (1 peice all black with a green cylinder), this one is 3 peices and the check valve itself is half gree and half white. white side has an arrow pointing towards the green half.