Description
Nelsen NRO4-50 4-Stage 50 GPD Reverse Osmosis System
Complete residential drinking-water RO system from Nelsen Corporation, supplier part 4-STAGE, 50GPD. It uses four treatment stages and includes the storage and installation components required for a standard under-sink installation.
- Rated production: 50 GPD
- 4-stage reverse-osmosis treatment
- Double O-ring filter housings
- Clear prefilter housing for sediment-filter inspection
- 3.2-gallon NSF-approved storage tank
- Push-connect fittings
- 3/8 in. faucet tubing
- Angle-stop adapter valve
- Chrome long-reach lead-free faucet
- Filter wrench included
- Nelsen shipping weight: 21.58 lb
This listing is for the complete NRO4-50 system. Confirm feed-water pressure, available installation space, drain connection, and replacement-filter requirements before installation.
Overview
- ✅ U.S.-based support and expert assistance
- 🧰 Built with trusted Pentair & Fleck components
- 🚚 Ships nationwide — freight-safe packaging
- ⚙️ Ideal for residential and light-commercial systems
Specs (Typical)
| Max Operating Pressure | 125 psi |
|---|---|
| Max Water Temp | 100 °F |
| Electrical | 120 V AC |
| Flow Range | 5–45 GPM (model dependent) |
Related: Control Valves • Parts • Get sizing help


