Description
This configuration introduces a significant upgrade: the 4-inch top opening. Moving from the standard 2.5″ to a 4″ opening on this 120L Pentair Structural vessel allows for much easier media loading and internal maintenance, making it a favorite for professional installers.
Here is the rewritten website content for the Pentair 1665 (120L) with the high-flow 4″ Non-Backwash Control Head.
Pentair Structural 1665 (120L) | 4-Inch Top Opening
Professional-Grade Non-Backwash Filtration System
Upgrade your water treatment setup with the Pentair 1665, featuring an oversized 4-inch top opening for easier access and media handling. Paired with our specialized High-Flow Non-Backwash Control Head, this 120-liter system is the premier choice for high-demand residential and commercial filtration where performance and ease of service are paramount.
Designed for “In-Out” flow media—such as Carbon, Calcite, or Mineral beds—this system maximizes contact time without the need for a drain line or power source.
[The Control] High-Flow 4″ Non-Backwash Head
Engineered for the 4-inch threaded interface.
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Effortless Monitoring: Features two ¼″ pre-tapped ports for inlet/outlet pressure gauges, allowing you to monitor pressure drop and media saturation instantly.
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High-Volume Flow: Designed to handle higher flow rates with minimal restriction, supporting plumbing connections from ¾″ to 1½″.
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Zero-Waste Design: Eliminates the backwash cycle entirely, saving thousands of liters of water and simplifying your plumbing installation.
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Maintenance-Free: No internal motors, gears, or seals to wear out, ensuring decades of reliable service.
[The Vessel] Pentair Structural 1665 (120L)
The industry standard for durability and ease of service.
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4-Inch Top Opening: The wide-mouth design makes pouring media like heavy carbon or minerals significantly faster and reduces the risk of spills during installation.
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120-Liter Capacity: Provides the perfect volume for whole-house dechlorination or light commercial pH balancing.
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Seamless HDPE Liner: A high-density polyethylene inner shell reinforced with high-strength fiberglass filament for ultimate pressure resistance.
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Corrosion-Proof Construction: 100% resistant to rust and degradation, making it ideal for high-humidity or coastal installations.
Why the 4-Inch Opening Matters
While standard 2.5″ openings are common, the 4″ threaded opening on this 1665 vessel is a professional-tier feature. It allows for:
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Faster Media Loading: No need for small funnels; pour media directly into the tank.
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Easier Inspection: Better visibility into the tank during maintenance or media replacement.
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Robust Connection: A larger surface area for the control head seal, ensuring long-term leak prevention.
Technical Specifications
| Feature | Specification |
| Vessel Brand | Pentair Structural |
| Model | 1665 |
| Opening Size | 4″ Threaded Top |
| Nominal Volume | 120 Liters |
| Max Working Pressure | 150 PSI (10.3 bar) |
| Plumbing Connections | ¾″ – 1½″ |
| System Type | Non-Backwash (In-Out) |
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