I tested two extra pumps I got from Rumores today. One is an IR Aro 66605J-3EB which has santoprene diaphragm, ball and check valves. Which is good for soap products. The second IR Aro pump is a PD02P-APS-PTT which has teflon disk, check and diaphragm. Which is good for harsher chemicals.
They both seemed to work just fine. They were both set around 20 – 30 psi.