Kevin
I have two of the 404 pumps in the same resivour.
I have used this res and pumps in many different configurations and different home made blocks during the last year and half and they are still working fine.(no it hasn't been 24/7).
They have done a lot of work in that year and half.
For the size and price I am happy.(and yes they are still quiet)
I use this to test for water leaks on my blocks to get what will be the best flow rate for that particular setup and so forth.They have seen suffcient run time and a lot of OFF and ON.
fresno12
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