We love the SeaLand T pumps and have had almost no problems. We recommend replacing the DuckBill Valves at least every two years. They are easy to service
. You MUST have a valve between the tank and any overboard
pump or the shoreside pump out systems will either invert the duckbill's or pull the seals
out of the Jabsco type pumps. Most manuals
make this clear.
It's also a good idea to have a vacuum break on the holding tank
in case of a clogged vent when using powerful shoreside pump-outs. Sealand sells a good one...