Schwalbe DV7A Inner Tube - 20 x 1 3/8 - 32mm Woods Valve

Schwalbe DV7A 20 x 1 3 / 8 " Standard inner tube with Dunlop / Woods valve. Fits Sizes: 28-440 5 00 x 28A 28-451 20 x 1 1/8 37-438 20 x 1 3/8 37-440 5 00 x 35A 37-451 20 x 1 3/8 B.S. Image is for illustration only. Specific sizes shown on the image may not be relevant to the tube in the description Why Choose Schwalbe Tubes? Schwalbe use the highest quality ingredients in the manufacture of their inner tubes, the purity of the rubber compound is critical for the quality of the tube. Before extrusion, the basic material is forced through a total of seven filters under enormous pressure. All tubes are inserted and inflated into a mould for the vulcanization process. This ensures an even wall thickness and high air retention . All tubes are inflated and stored for 24 hours to test for air retention. Afterwards, every tube is carefully checked by visual inspection before packing. As a result of this the Schwalbe inner tube has been the top choice of German bicycle dealers for its quality a