Accumulators tend to discharge over time and provided the bladder or diaphragm remain in good condition we can recharge them to the required pressure. Should it not be possible we will look to quoting either to replace or repair the unit. For any of your accumulator servicing requirements please do hot hesitate to contact White House Products Ltd on +44 (0)1475 742500 or send to us clearly stating who is sending it in with contact name and number, what is wrong with it for a no obligation quotation for repair / service or replacement. If you would like to send an accumulator to us for service: Log into your accoutn and go to "MY ACCOUNT" > Returns > NEW REQUEST to organise this.