Can someone lend some advice?? Our new (to us) trailer came with no cap on the water fill line, just an open pipe protruding through the street side of the trailer. Now, if I recall correctly, , isn't there supposed to be a filler cap in place, with a fitting to allow pressure from a bicycle pump, in order to pressurize the system?? If so, where could I find such a cap, or must I cobble one together myself? Also, should the filler cap have a provision to attach a garden-type hose, in order to have continual water supply??