I respectfully request a price for brazed double walled tube in the following sizes; 3/16" O.D., 1/4" O.D., 5/16" O.D. & 3/8" O.D. all with 0.028" wall thickness. Please quote on a cost per foot basis. Tubing to be shipped FOB to Detroit, Michigan. Tubing to cut to approxiumately 20 foot lengths. O.D. coating to be PvF or PvdF over zinc.