Size allen wrench for 12v pump pressure adjustment?

Was wondering if anyone knew the answer to this off the top of their head? Just installed a new Delevan 2.2 gpm on my wfp setup, and looking to bump up the pressure a bit until I can get a new flow controller installed on it.

My weak little TSC power flow didn’t have the guts that the delevan does, and so it wasn’t cycling like the new pump is.

I don’t have that pump, but a RHG pump. The switch screw head was SAE if I recall right, but I didn’t adjust it