That might has something to do, with the fact that katadyn took PUR over. The company might not have intergrated enough for certain details.

Your lucky you have the new katadyn pocket with outlet nipple and hose. I have the old version, with a output nozzle, made is such a way that could not mount a tube on it. To prevent cross contamination or something. Which has a rather interesting result, when your holding holding a bottle between your legs, standing close to the water, while trying to pump. I followed a tip i found on a review of the pocket and used a file to modify mine to accept output hoses.