How to adjust the flow on Tunze 3163 filter

[Kongo]

I've recently bought the Tunze 3163, but I’m not sure how to adjust the flow on the pump. The 3162 and 3161 have a straightforward adjustment wheel, but I don’t see a similar feature on the 3163.

Can anyone help me out?
Thank you!

 

[Quietman]

I don't think it is adjustable. One reason I went with the 3162. But to be honest, I ended keeping flow on max to drive water through media and filters and never fooled with the dial after that initial setup.

I adjust direction frequently as things grow or when I move filter which is much more useful for me.

 

[Kongo]

I don't think it is adjustable. One reason I went with the 3162. But to be honest, I ended keeping flow on max to drive water through media and filters and never fooled with the dial after that initial setup.

I adjust direction frequently as things grow or when I move filter which is much more useful for me.

I would have gone for 3162 as well had I known. I assumed the 63 would have the adjustable function as well. Especially since it's the latest edition and promoted for nanos.

The flow is too high for my 13 gallon cube:

 

[Quietman]

I would have gone for 3162 as well had I known. I assumed the 63 would have the adjustable function as well. Especially since it's the latest edition and promoted for nanos.

The flow is too high for my 13 gallon cube:

Unfortunate. I really like the 3162 and have used it for years for both my freshwater and sw set ups. Not sure if returning or swap is an option. There's always the DC control pump but that's pretty pricey for a filter. Tunze is a good name so you should be able to get 50-75% of money back on a marketplace since it's new.