If you are the original owner, I would contact the vendor you purchased it from. More than likely you are out of warranty(if there was one) but they should be able to sell you a replacement pump. If that vendor does not want to provide service parts for it, or you bought it second hand, I would contact any reputable Deltec dealer. Kingfish is a great Deltec source and I bet they will be able to get you the replacement pump you need.