Description
This configuration features the Pentair Structural 1665 with the industry-standard 2.5″ top opening. It is the go-to choice for installers who want the world-class reliability of a Pentair tank in a slim, space-saving profile that fits standard 2.5″ control heads.
Here is the rewritten website content for the Pentair 1665 (120L) with the 2.5″ Non-Backwash Control Head.
Pentair Structural 1665 (120L) | 2.5-Inch Standard Top
Compact Efficiency for Professional Non-Backwash Filtration
Optimize your water treatment footprint with the Pentair 1665 (120L) vessel. Paired with our High-Flow Non-Backwash Control Head, this system provides a high-capacity filtration solution in a slim 16″ diameter profile.
Designed for media that operates on an “In-Out” flow path—such as Activated Carbon, Calcite, or Mineral beds—this 120-liter setup delivers premium water quality with zero water waste, no drain line requirements, and no electrical power needed.
[The Control] 2.5″ High-Flow Non-Backwash Head
The simple, robust heart of your filtration system.
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Universal Compatibility: Fits the standard 2.5″ NPSM tank opening, making installation and future upgrades seamless.
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Integrated Pressure Monitoring: Includes two ¼″ pre-tapped ports for easy gauge installation, allowing you to monitor flow performance and media life at a glance.
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Plumbing Versatility: Supports high-flow connections from ¾″ to 1½″, ensuring your system maintains consistent pressure even during peak demand.
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Eco-Friendly & Maintenance-Free: By eliminating the backwash cycle, you save thousands of liters of water annually. With no moving internal parts, it is built for “set-it-and-forget-it” reliability.
[The Vessel] Pentair Structural 1665 (120L)
The gold standard in composite tank technology.
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Space-Saving 16″ Diameter: At 65″ tall, this vessel provides a substantial 120-liter capacity while occupying minimal floor space—perfect for tight mechanical rooms.
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Heavy-Duty Construction: A seamless, high-density polyethylene (HDPE) inner shell reinforced with professional-grade fiberglass filament winding.
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100% Corrosion-Proof: Completely resistant to rust and chemical degradation, ensuring decades of service in any environment.
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NPSM Threaded Opening: Precision-engineered 2.5″ threads ensure a perfect, leak-free seal with the control head.
Ideal Applications
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Whole-House Carbon Filtration: Efficiently removes chlorine, tastes, and odors for large families.
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pH Correction: Ideal for Calcite or Magnesite beds to neutralize acidic water.
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Pre-Filtration for RO: Protects sensitive Reverse Osmosis membranes from organic fouling.
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Remineralization: High-volume mineral infusion for pure water systems.
Technical Specifications
| Feature | Specification |
| Vessel Brand | Pentair Structural |
| Model | 1665 |
| Opening Size | 2.5″ NPSM |
| Nominal Volume | 120 Liters |
| Dimensions | 16″ Diameter x 65″ Height |
| Max Operating Pressure | 150 PSI (10.3 bar) |
| Plumbing Connections | ¾″ – 1½″ |
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