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Raleigh Hand pump

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If it works like the one on a '60's Norton Atlas, the threaded fitting you can see (for the valve stem) is on the end of the rubber air line which is pushed up into the pump. You pull the line out and there's a screw with male threads on the other end. This screws into the other end of the pump. A lot of times rust and dirt make it hard to pull the air line out, it was a snug fit. This was for motorcycles, but the pump looked similar to the ones on bicycles.
 
If it works like the one on a '60's Norton Atlas, the threaded fitting you can see (for the valve stem) is on the end of the rubber air line which is pushed up into the pump. You pull the line out and there's a screw with male threads on the other end. This screws into the other end of the pump. A lot of times rust and dirt make it hard to pull the air line out, it was a snug fit. This was for motorcycles, but the pump looked similar to the ones on bicycles.
What does it mean when the air pressure stops in the connection tube?
Cheers
 
Hope this works

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