can you use just one outlet....and do you have to close the other?

I would not knot or restrict the other outlet any more than needed- limited restriction. both outlets are ran by the unit it self. will cause the unit to fail by stress on the whole system

can you use just one outlet....and do you have to close the other?

There is no built in method to turn off one of the outlets no. You would need to stick a valve on the end of one outlet and close it.

what is the minimum flow rate?

The AP-4 Air Volume is 275 cu.in/min.

Would this model be strong enough iff attached to 2 twelve inch airstones in a 75 gallon aquarium??

Yes, it is. I had one 12" airstone and a 3" round one. This works so well that I don't have it turned up all the way. Fortunately, it's adjustable so you have more control over the output.

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Danner

Product ID: 9565996

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✅UL/ETL certified

🌊Max depth 4ft

💨275 cu.in/min airflow

Description

💧 Dive into Freshness with Every Bubble!

EXTENDED REACH - 6-foot cord for flexible placement options.
CERTIFIED QUALITY - Trust in UL/ETL standards for safety and reliability.
EFFICIENT PERFORMANCE - Low volume design ensures quiet operation without sacrificing power.
VERSATILE COMPATIBILITY - Perfect for both freshwater and saltwater setups.
BREATHE LIFE INTO YOUR AQUARIUM - Transform your aquatic environment with optimal oxygenation.

The Danner Manufacturing Supreme Oxy-Flo AP-4 is a low volume air pump designed for aquariums, delivering a powerful airflow of 275 cu.in/min while maintaining a maximum water depth of 4 feet. It is compatible with both freshwater and saltwater environments, features a 6-foot cord for versatile placement, and is certified to UL or ETL standards for safety.

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