Review on 🐠 Penn Plax PEN-019 Air Pod Aquarium Air Pump - Power Outage Auto On, Ensures Fish Safety, 55 Gallon Capacity by Michelle Lynn

Excellent machine! Does more than I hoped. You can set the air pressure to your liking and the automatic battery backup works wonders. This is the first dual line air pump I've ever tried, so I don't know if it's okay to have one line with a little more air pressure than the other. The lines are not the same length, that could be part of the problem. However, the pressure difference is hardly noticeable and should not be a problem for anyone. You can't adjust the pressure when running on battery power, but it's constant and strong enough to keep your system from starving. It vibrates a little more than I would like, but given its size I can't complain, but the noise is minimal.