I went into West Marine and looked at a rebuild kit for about $48 that did not include the seal for the pump shaft. Was debating the purchase when I saw they had the complete head on sale for $99 (this was about 10 years ago). It is easier to replace the complete head than do the rebuild so the old ones went into the dumpster. We have 2 heads and have since converted one of the Jabsco to Raritan PHII. The Raritan is a better unit but installation was not super simple. If I had it to do all over again I would go with another Jabsco and figure to change replace it at 10-12 years.