The Blackburn bicycle pump part number 7132307 is the best sealing pump I have ever used. They achieved this by threading the rubber. No doubt every one is going to copy this innovation. The pump says it is good for 120 psi but it gets fairly hard to pump at 80 psi. This has nothing to do with the quality of the pump but the size of the barrel. As always you can get more pressure from any pump by replacing the grese with Dow Corning high vacuum grease.
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