I have two ARO Diaphragm Pumps. Model:INGERSOLL RAND ARO SD10S-CSS-SIT-A One on a cart with compressed air regulator and the other as a back up during pump rebuilds. Which could easily become another cart system. We haven’t had any problems with either pump. Each have been rebuild once a year and have a few additional rebuild kits for them.   We used the Diaphragm pumps to package and not spin product or burn out pumps when product wasn’t required. These pumps can get up to 54 GPM up to 235ft. Pump with cart & Regulator $4,000 Pump without cart $3,500