Res and pump combo

[delpy8]

Hi guys
Another noob question. I'm looking for the smallest combo and I like the size of the below But it's saying cannot be used as stand alone unit

https://www.overclockers.co.uk/showproduct.php?prodid=WC-446-EK&groupid=962&catid=2133&subcat=1845

 

[GiraffePencils]

That means you can't swap the pump out and use it as just a res.

 

[delpy8]

That means you can't swap the pump out and use it as just a res.

Thanks for that makes sense