Track Pump Heads

We've had a rennkompressor on shop floor duty for 9 months. The original tube and schraeder/presta adaptor lasted for about 6 or 7. That's a VERY long time when you factor in 3 or 4 customers using them every hour, and most of the time thoroughly abusing it and using it incorrectly.

The seal on the presta adaptor is adjustable and replacable. The beauty of that unit is that it is infinitely fixable with minimal effort. If the presta seal failed on our pump, it was normally resolved by disassembling it and re-adjusting the fit of the metal outer casing, or simply chucking in a new rubber seal which cost all of 3 pence.

We only had to swap out the end after some retard tore off the entire hose/nozzle and stood on it.

bought a rennkompressor in 1992, this came with a substantial push-pull Presta brass head. Apart from occasionally replacing the rubber seal in this and once replacing the rubber washer in the main barrel it worked faultlessly --- until six months ago when a heavy flying object gave the barrel a severe dent. So took out a mortgage to buy a new one.(best deal - BikeBitsuk , he's old school - drives to Belgium and gets the stuff himself). Maybe I'm a fool but good design should be foolproof and that Presta/Shraeder head was awkward from the start and then became troublesome. Solution -- replace with with original 1992 head which has a larger rubber seal and also inserts over the valve to a much greater depth.