Berkey RB4X2-BB+PF2 Water Filtration System
- Capacity: 3.3 gallons
- Purification: Activated Carbon
- Install Type: Countertop
- Material: Stainless Steel
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A capable no-plumbing filtration setup for households wanting gravity filtration plus fluoride reduction, provided the counter height works in your space.
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ASIN: B002R8ON3IModel: RB4X2-BB+PF2Category: Water Filtration Systems
Overview
Gravity does the work in the Berkey RB4X2-BB+PF2, a two-chamber countertop system in stainless steel holding 12.65 liters. It pairs Berkey's Black Berkey (BB) elements with PF2 fluoride-reduction filters.
Water poured into the upper chamber drips through the filter elements into the lower chamber for use, so nothing needs to be plumbed in or powered. The PF2 add-on is specifically for fluoride reduction, a contaminant standard carbon elements do not remove on their own.
- 12.65 liter capacity
- Stainless steel build
- Black Berkey plus PF2 fluoride filters
- Countertop gravity design
Who it's for
Suits anyone wanting filtration without installation, including renters, off-grid households, or backup filtration during outages. Less suited to a tight kitchen counter given its 23 inch height.
Pros and cons
- Works without a water line or power source
- Stainless steel construction for both chambers
- PF2 filters add fluoride reduction beyond standard carbon
- Stands 23 inches tall, more clearance than a pitcher
- Gravity filtration is slower than a pumped or plumbed system
Performance notes
Activated carbon handles the primary filtration as water gravity-feeds between the two stainless steel chambers, while the added PF2 elements target fluoride specifically. At 12.65 liters total capacity and 4.4 lb, it is sized for household rather than single-serving use.
Specifications
| Brand | Berkey |
|---|---|
| Model | RB4X2-BB+PF2 |
| Dimensions & fit | |
| Weight | 4.4 poundslower than 83% of 41 water filtration systems |
| Dimensions | 9.5 × 23 × 9.5 inches |
| Dimensions | 9.5 x 23 x 9.5 in |
| Capacity & performance | |
| Capacity | 3.3 gallonslower than 62% of 46 water filtration systems |
| Construction & materials | |
| Material | Stainless Steel |
| Compatibility & installation | |
| Install Type | Countertop |
| Other details | |
| Purification | Activated Carbon |
Closest rivals on specs
Culligan MCV701B Water Filtration System- Weight 4.4 vs 5.01 pounds (-12%)
iSpring UVF11A Water Filtration System- Capacity 3.3 vs 1 gallons (+230%)
- Weight 4.4 vs 2 pounds (+120%)
Waterdrop WD-M6CG Water Filtration System- Capacity 3.3 vs 1.1 gallons (+200%)
- Weight 4.4 vs 11.8 pounds (-63%)
Frequently asked questions
Does the Berkey RB4X2-BB+PF2 remove fluoride?
Yes, this configuration includes PF2 filters added specifically for fluoride reduction alongside the standard Black Berkey elements.
Does this system need to be plumbed in?
No, it is a gravity-fed countertop unit with two stainless steel chambers and no water line hookup.
How much water does it hold?
The system holds 12.65 liters total across its upper and lower chambers.