CPVC Eccentric Reducer Coupler
The CPVC Eccentric Reducer Coupler is a type of CPVC pipe fitting used to connect two pipes of different diameters while keeping one side of the pipe aligned along the same axis. Unlike an eccentric reducer, the centerline of the smaller pipe is offset, allowing the bottom or top of the pipes to remain level. It is commonly used in piping systems where maintaining a constant top or bottom pipe level is important to prevent air accumulation, ensure proper drainage, and maintain smooth fluid flow. CPVC Eccentric Reducer Couplers are widely used in water supply, chemical processing, and industrial piping systems due to their corrosion resistance, high temperature tolerance, and durable performance.
The CPVC Eccentric Reducer Coupler is a precision-engineered pipe fitting designed to connect two pipes of different diameters while maintaining a smooth and uninterrupted flow. Unlike concentric reducers, the eccentric design ensures that the bottom of both pipes remains aligned, preventing air accumulation and fluid pooling—making it ideal for horizontal installations in drainage, chemical, and industrial fluid systems. This fitting offers excellent chemical resistance, high thermal stability, and mechanical strength for demanding industrial environments. It’s especially suited for applications involving hot and corrosive fluids.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
CPVC Eccentric Reducer Coupler Details
OD₁ – Outer Diameter of Larger End
OD₂ – Outer Diameter of Smaller End
ID₁ – Inner Diameter of Larger End
L – Length of the Reducer
H – Height (or Body Height)
| Size (NB) | OD₁ (mm) | OD₂ (mm) | ID₁ (mm) | L (mm) | H (mm) |
| 1¼″ × 1″ | 42.16 | 33.40 | 35.0 | 90 | 13 |
| 1½″ × 1¼″ | 48.26 | 42.16 | 40.9 | 95 | 14 |
| 2″ × 1½″ | 60.33 | 48.26 | 52.5 | 100 | 16 |
| 2½″ × 2″ | 73.03 | 60.33 | 64.1 | 110 | 18 |
| 3″ × 2½″ | 88.90 | 73.03 | 77.9 | 120 | 20 |
| 4″ × 3″ | 114.30 | 88.90 | 100.8 | 140 | 24 |
| 6″ × 4″ | 168.28 | 114.30 | 152.2 | 160 | 30 |
| 8″ × 6″ | 219.08 | 168.28 | 202.7 | 180 | 35 |
| 10″ × 8″ | 273.05 | 219.08 | 254.5 | 200 | 42 |
| Property | Details |
| Product Type | 90° Elbow (Right angle pipe fitting) |
| Function | Changes the flow direction by 90° |
| Material | CPVC (Chlorinated Polyvinyl Chloride) |
| Size Range | ½” to 6” (or higher, depending on standard) |
| Connection Type | Socket (Solvent Cement) / Threaded (FNPT) |
| Pressure Rating | Up to PN16 / 10–16 bar (depends on SDR & temp) |
| Temperature Range | Up to 93°C continuous service |
| Manufacturing Process | Injection molded |
| Standards | ASTM D2846, ASTM F441, ASTM F439, NSF 14/61 |
| Color | Light grey / off-white |
| Flow Characteristics | Smooth internal surface reduces friction |
| Installation | Solvent welding (leak-proof joint) |
| Applications | Industrial fluids, hot & cold water systems |
| Density / Specific Gravity | ~1.55 g/cm³ |
| Tensile Strength | ~55 MPa |
| Flexural Strength | ~104 MPa |
| Modulus of Elasticity | ~2500–2800 MPa |
| Compressive Strength | ~70 MPa |
| Impact Strength | ~80 J/m (Izod) |
| Hardness | Rockwell ~119 |
| Water Absorption | ~0.03% |
| Heat Deflection Temperature | ~103°C |
| Thermal Conductivity | ~0.14 W/m·K |
| Coefficient of Thermal Expansion | ~6.1 × 10⁻⁵ /°C |
High Chemical Resistance: Inert to a wide range of corrosive chemicals, making it ideal for aggressive environments.
Thermal Stability: Can withstand continuous operating temperatures up to 93°C (200°F).
Corrosion-Free: Unlike metal rings, CPVC backing rings will not rust or corrode, even in moist or chemically reactive conditions.
Lightweight and Durable: Offers mechanical strength while being easier to handle and install compared to metal alternatives.
Smooth Surface Finish: Provides consistent pressure distribution and sealing with minimal surface friction.
UV and Weather Resistant: Suitable for use in both indoor and protected outdoor installations.
Compatible Design: Works seamlessly with CPVC stub ends and flanged fittings for reliable joint assembly.
| Nominal Size (Inch) | Pressure Rating at 23°C (psi) | Pressure Rating at 23°C (bar) |
| ½” × ¾” | 400 psi | 27.6 bar |
| ¾” × 1″ | 400 psi | 27.6 bar |
| 1″ × 1½” | 315 psi | 21.7 bar |
| 1½” × 2″ | 315 psi | 21.7 bar |
| 2″ × 3″ | 280 psi | 19.3 bar |
| 3″ × 4″ | 230 psi | 15.9 bar |
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using CPVC Eccentric Reducer Coupler
Prevents Air Accumulation
The eccentric design keeps one side of the pipe level, which helps prevent air pockets in the piping system.
Smooth Flow Transition
It allows a gradual change in pipe diameter, reducing turbulence and improving fluid flow efficiency.
High Corrosion Resistance
CPVC material resists corrosion, rust, and chemical reactions, making it suitable for chemical and water applications.
High Temperature Resistance
CPVC can handle higher temperatures compared to standard PVC, making it suitable for hot water and industrial systems.
Lightweight and Easy Handling
The lightweight nature of CPVC makes installation and transportation easier than metal fittings.
Leak-Proof Joints
When installed with solvent cement, it creates strong and reliable leak-proof connections.
Low Maintenance
CPVC fittings require minimal maintenance because they do not scale, rust, or degrade easily.
Long Service Life
CPVC piping systems are durable and can provide reliable performance for many years.
Cost-Effective Solution
Compared to metal reducers, CPVC fittings are more economical while still providing excellent performance in many applications.
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using CPVC Eccentric Reducer Coupler
High Corrosion Resistance
CPVC backing rings are highly resistant to chemicals, acids, and alkalis, making them ideal for corrosive environments.
Strong Flange Support
They provide strong mechanical support to CPVC flanges, helping maintain proper alignment and preventing flange damage.
Leak-Free Sealing
By ensuring uniform gasket compression, backing rings help create a tight and reliable seal at flange joints.
Lightweight Material
CPVC backing rings are much lighter than metal rings, making installation and handling easier.
High Temperature Resistance
CPVC can handle higher temperatures compared to standard PVC, making it suitable for hot water and industrial applications.
Excellent Chemical Compatibility
They perform well in chemical processing, water treatment, and industrial fluid handling systems.
Low Maintenance
CPVC backing rings require minimal maintenance due to their non-corrosive and durable material.
Long Service Life
Their resistance to corrosion, scaling, and chemical attack ensures a longer operational life in piping systems.
Cost-Effective Solution
Compared to metal backing rings, CPVC versions offer a more economical option with similar performance in many applications.
Easy Installation
The design allows quick installation with CPVC flanges and pipes, reducing labor time.
Types of CPVC Eccentric Reducer Coupler
Socket (Slip) Eccentric Reducer Coupler
This type has socket ends that allow pipes to be joined using solvent cement welding, providing a strong and leak-proof connection.
Threaded Eccentric Reducer Coupler
Designed with internal or external threads to connect pipes using threaded joints, making installation and removal easier.
Schedule 40 CPVC Eccentric Reducer Coupler
Used in low to medium pressure applications such as general water supply systems.
Schedule 80 CPVC Eccentric Reducer Coupler
Manufactured with thicker walls for higher pressure and industrial piping applications.
Industrial CPVC Eccentric Reducer Coupler
Specifically designed for industrial systems that handle chemicals, corrosive fluids, and higher temperatures.
Custom Size Eccentric Reducer Coupler
Manufactured in special sizes or configurations to meet specific piping system requirements in industrial projects.
Applications of CPVC Eccentric Reducer Coupler
Process Industry
High Purity Applications
Electronic Industry
Electrical Industry
Semi-conductors Industry
Pharmaceutical Industry
Solar power panels
Sugar Industry
Paper & Pulp Industry
Nuclear Power Industry
Automotive Industry
DI water plants
Why Choose Petron Thermoplast?
At Petron Thermoplast, CPVC Backing Rings are critical components in piping systems, ensuring smooth flow transitions and efficient use of space. Understanding the dimensions and applications of the CPVC Backing Ring is essential for designing reliable and efficient piping systems. By adhering to standards such as ASME B16.9, engineers can ensure compatibility and performance across various industries.
