been having problems with loosing pressure over a few days, checked for leaks and cant find any! checked the pipe outside (cant rember what it called) and no signs of water, sum one told me to check the pressure vessel, so i checked it and when testing the pressure with a tester water came out aswell as air? is this normal, or is it just like a inner tube and meant to contain air? is it puntured? i tested and seem to get bout 7 psi what pressure is it meant to be at?