Did you need to replace the diaphragms yet? I see Zoro gets $135.16 https://www.zoro.com/aro-pump-repair...43/?q=G1876043 for the kit, and QP & C gets $72.53 for the same kit http://www.qpandc.com/Pump_Parts-Pum...t_Fluid_4.html
I like to have rebuild kits for my critical pumps when possible.