appear to be too large to screw far enough down on the SPV valve to open it. This is only because Manitou put that little flange around the schraeder valve on the SPV. A Fox pump (at least the older models) for example won't work. If your pump will work on the SPV side it will also work for the main air chamber.jtbrill632 said:Reading the Manitou manual online it appears that they say you need to have two different pumps, one for the can and as they put it, a dedicated pump for the SPV, is this correct? Thanks, I just found this web site, lots of great info!