Can i use a Petco 4 output pump for a 2 column farm?

11:53 pm in Uncategorized by Aviram

Wondering if anyone can help.

In the Petco near my house they have only have the 9904 pump (4 outputs) but not the 9902 pump (2 outputs).

I want to build a 2 column farm.

Can I buy the 9904 with 4 outputs and just use 2 of them? how will i block the other 2?