I replaced my manual heads with new Jabsco Quiet flush fresh water heads in 1994. I lived aboard the boat until Dec of 2010 and never had a problem except a cracked base which was easily replaced. I love them and don't have the smell you get from salt water flushes.
It does go through a lot of water but I carry 200 gallons. I have spent 8 days cruising without taking on water with another couple aboard but we did a few shore showers.
I highly recommend these heads as they have survived the Heads aboard the Heads Up.
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