Air line size for Octo Classic 150-S

[Fishingandreefing]

Just want to see if anyone knows the air line tubing size for this skimmer. Looks like 5/16 ID for me.

I will running it throw the window to boost ph.

thanks

 

[vetteguy53081]

Just want to see if anyone knows the air line tubing size for this skimmer. Looks like 5/16 ID for me.

I will running it throw the window to boost ph.

thanks

15/32" ID (9/16OD) Tubing​