Replacement Pump fits Evaporative cooler EV3100 EV3200 EV3200H EV3500 and most Hessaire and Honeywell models.

This pump has build in water level switch, it will turn the water plump off when no water in tank to prevent it from burning. so no worries if you forgot to add water to your cooler.  

To mount the the water level switch use paper clip or hard wire, twist both ends to circle shape and install see pic 5,6,7.