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They did have a lot of issues with the Parker products and if this were me, I would check around at the RV "graveyards" and find a good used pump system from a wrecked unit and buy it. The upgrade should be pretty easy and way cheaper than rebuilding these all the time. Look in your area. Also try Arizona RV Salvage for some parts............I have bought from them a few times. Hope that proves helpful here. Please get back to me if you need more later as all follow ups are included in our fee. R.J.