I used one of these every day for three months. I only have a 30 gallon combined tank (Airstream Bambi…no grey tank.)
It worked flawlessly until one of the bayonet clips broke. I bought a replacement as I don’t have time for warranty to replace it. The second one broke in less than 30 days, exact same bayonet broke. Camco was gracious and replaced BOTH pumps (the complete kits) even though I would have been thrilled with just the Macerator housing as th pump were fine, and I really don’t need all of the extra accessories.
I believe what was happening is the water pressure when using the cleaning port would blow out the seal changing the connection angle and putting undue stress on the bayonet in that position.
Now I just limit the amount of water when using the xleaning port.
I also made a small wooden stand to reduce pressure of the heavy motor hanging from the waste port on the camper.
Other than that, this is an excellent product if you don’t have close enough access to a Cleanout. Or if you need to fill a honey wagon while it’s in the back of the truck.