Our 440 has no isolation valves on the freshwater storage
, this means if one tank gets bad water
in it the whole lot's bad.
Also you cannot isolate either tank to enable you to control and manage precious water
SS manifold i've made with isolation valves to pumps and each tank is simple and allows proper management.
Not sure if other Lagoons are so built but if you check and consider what a total loss of water could mean to you for the sake of maybe $60:00 of valves (no doubt others may spend $800:00 by buying