Bought one of these recently and am rethinking my flow plans. Rather than needing a 4-way, I only really need a 2-Way. Mine is the model #3, which alternates between 1,3 and 2,4, so is there any reason I cannot plug 1 and 2? The pump I am using is on the low end of flow (approx. 500 gph) so I would not thing routing water through 3 and 4 only would create problem?