Posted for "Alan K. Adamson" <aadamson@highrf.com>:

 Just a quick update.
 
 I talked with SMC (the fitting manufacturer) about the use of Poly-flo (or
 polyethylene) tubing.  Your kit probably included 44-P.  It's compatible
 with the .250 fittings that I mentioned below from mcmaster carr (the ones I
 point to below are made by SMC).  If you want colors, mcmaster also has the
 tubing.  You want the .250 OD x .170 ID x .040 wall thickness in
 polyethylene with a hardness of 94.  They have 6 or so colors avail.  Can be
 used for pitot and static.
 
 Alan