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💧 Upgrade your hydration game with the ultimate RO membrane—because your water deserves the best.
The A. O. Smith AO-US-RO-MEM is a genuine replacement reverse osmosis membrane designed exclusively for AO-US-RO-4000 systems. It reduces up to 99% of harmful contaminants including lead, fluoride, arsenic, chromium, and nitrates, ensuring safe, clean drinking water. Certified to NSF/ANSI Standard 58 by IAPMO, this membrane offers reliable performance for approximately 12 months. Note: It does not include the 90-degree elbow drain connector, which should be reused from the previous membrane.










| ASIN | B07PVZG45X |
| Best Sellers Rank | #74,638 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #481 in Replacement Under-Sink Water Filters |
| Brand Name | A. O. Smith |
| Customer Reviews | 4.5 4.5 out of 5 stars (242) |
| EU Spare Part Availability Duration | 1 years |
| External Testing Certification | IAPMO, ANSI, NSF |
| Item Dimensions D x W x H | 2.95"D x 2.85"W x 2.8"H |
| Item Weight | 1.1 pounds |
| Manufacturer | AO Smith |
| Manufacturer Part Number | AO-US-RO-MB-4000 |
| Material Type | Polycarbonate (PC) |
| Model Number | AO-US-RO-MB-4000 |
| Number of Items | 1 |
| Product Benefits | Removes Lead, Reduces Fluoride, Removes Arsenic, Reduces Chromium, Reduces Nitrate |
| UPC | 811640030230 |
| Unit Count | 1 Count |
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