They are not as advertised. Bought this after visiting the website thinking the 1" ID advertised would speed things up considerably as it currently takes around 3-4 minutes to pump 20 liters of fuel using similar siphon tubes bought elsewhere became. They arrived yesterday and are not 1 inch inside diameter. The outside diameter of the siphon valve itself is 7/8 inch, but the inside diameter in the holes is only 1/2 inch and the plastic tubing isn't even 3/8 inch inside diameter. In short, they are inferior to those I have already used.
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