Reef octopus classic 200 int tubing sizes

[Fishface515]

Anyone know what size the air inlet and drain lines are for a reef octopus Classic 200 int? I want to order new silicone hoses and Not sure what size they are or whether they go by id or od when buying replacements.

 

[Doctorgori]

I have the 200 classic and the INT ….It looks like 1/2 O.D and 3/8 I.D
I’m pretty sure it’s NOT 1/2 I.D
hope the pics help