Why are owners of self-service carwashes and tunnel prep unit owners swapping out their old pumps for this Hypro 2345B-P Plunger Pump? That's because they're specially made for use in the carwash industry, with a maximum pressure rating of 2500 PSI and a flow rate of 4.8 GPM. Furthermore, they're equipped with heavy-duty oil seals and with stainless steel valves and seats fabricated to resist chemical damage.