FZONE ATO tube size

rjp83 · Apr 20, 2026

Hi all. Does anyone use the fzone smart ATO system and happen to know the diameter of the water tube? I need to make a new longer run from the chamber to my new 75g. I believe it’s 7mm ID but just want to confirm ID and OD.
TIA

Mebbid · Apr 21, 2026

The Fzone tubing fit my hydros water pump which is 6.5mm ID.

To be sure, put the part of the pump where the tubing connects between 2 parallel flat surfaces, measure the distance between them. Assuming you don't have calipers that is.

rjp83 · Apr 23, 2026

Mebbid said:
The Fzone tubing fit my hydros water pump which is 6.5mm ID.

To be sure, put the part of the pump where the tubing connects between 2 parallel flat surfaces, measure the distance between them. Assuming you don't have calipers that is.

Mine came out to 7. Bought some 7mm Id tube and it worked perfect. I bet I could have used the 6.5 as well. Thank you for the input