Goron what are you on about? - this thread turned from talking about the shurflo that this guy was wanting to replace to him being told he needed a new accumalator - the accumalator has everything to do with how the water comes out of the wand so I dont know what you are on about - you are confusing the demand pump and pressure vessel with the nitrogen accumalator that is downstream of the waterbox - as tony gill says it stops the pump cycling and takes pressure