R4X40

Six models for flow rates up to 6,600 US GPD

  • Reverse osmosis system for whole house, boiler feed water, humidifiers, greenhouses, process water and other applications
  • Low-pressure protection with microprocessor auto reset
  • 20 in. prefilter and prefilter pressure gauge
  • Six models for flow rates up to 6,600 gallons per day

Approval/Certification Information

For product-specific approval information, please refer to the product’s specification sheet or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:


ASSE CSA FM Approvals NSF
UL ULC USC WQA