Product Overview
The Fernco P1002-43 coupling is designed to provide a reliable and leak-proof connection between a 4-inch clay pipe and a 3-inch cast iron or plastic pipe. This versatile coupling ensures a positive seal against infiltration and exfiltration, making it suitable for various plumbing applications. Its robust construction with stainless steel clamps offers corrosion resistance and durability.

Figure 1: Fernco P1002-43 Coupling. This image displays the black flexible coupling with two stainless steel clamps, designed for connecting pipes of different materials and sizes. The model number '1002-43' is visible on the body of the coupling.
Key Features
- Connects 4-inch clay pipe to 3-inch cast iron or plastic pipe.
- Provides a positive seal against infiltration and exfiltration.
- Equipped with corrosion-resistant and rustproof stainless steel clamps.
- Designed for quick and easy pipe connection.
- Leak-proof and root-proof design.
- Resistant to chemicals, ultraviolet rays, fungus growth, and normal sewer gases.
Setup and Installation
Proper installation of the Fernco P1002-43 coupling is crucial for ensuring a secure and leak-free connection. Follow these steps carefully.
Preparation
- Ensure both the 4-inch clay pipe and the 3-inch cast iron or plastic pipe ends are clean, dry, and free from debris.
- Inspect the coupling for any damage or defects before installation.
- For easier installation, especially in colder conditions, the coupling can be warmed slightly (e.g., by leaving it in the sun) to increase its flexibility.
- Confirm that the pipe ends are properly aligned and supported.
Installation Steps
- Loosen the stainless steel clamps on the coupling using a nut driver or screwdriver until they are fully open.
- Slide the coupling onto one of the pipe ends (e.g., the 4-inch clay pipe) until it is fully seated and covers the end of the pipe.
- Align the second pipe end (e.g., the 3-inch cast iron or plastic pipe) with the open end of the coupling.
- Slide the coupling back over the joint, ensuring that it covers an equal portion of both pipe ends. The coupling should bridge the connection point completely.
- Center the stainless steel clamps over the pipe ends, ensuring they are positioned correctly for maximum grip.
- Tighten the clamps evenly and securely. Alternate tightening each clamp to ensure uniform pressure around the pipe. Do not overtighten, but ensure a firm, leak-proof seal.
- Verify the connection is stable and visually inspect for any gaps or misalignments.
Note: The diameters referenced for the coupling are typically internal diameters (ID). A 4-inch clay pipe may have an outer diameter (OD) of approximately 5-1/2 inches. Ensure compatibility with your specific pipe dimensions.
Operating Principles
The Fernco P1002-43 coupling operates on the principle of creating a flexible, yet robust, seal between pipes of different materials and sizes. The elastomeric material of the coupling conforms to the outer surface of the pipes, while the stainless steel clamps apply uniform radial pressure. This pressure compresses the coupling material against the pipes, forming a watertight and airtight seal that prevents leakage and root intrusion. The flexibility of the coupling also allows for minor pipe misalignment and movement, accommodating ground shifts or thermal expansion/contraction without compromising the seal.
Maintenance
Fernco couplings are designed for long-term durability with minimal maintenance. However, periodic inspection can help ensure continued optimal performance.
- Visual Inspection: Periodically inspect the coupling for any signs of wear, cracking, or deterioration, especially if exposed to harsh environmental conditions.
- Clamp Tightness: Check the tightness of the stainless steel clamps. While designed to maintain tension, extreme temperature fluctuations or ground movement might necessitate a minor re-tightening.
- Cleanliness: Ensure the area around the coupling remains free of excessive debris or corrosive substances that could potentially degrade the material over extended periods.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Leakage at connection | Clamps not tightened sufficiently; improper pipe alignment; damaged coupling. | Ensure clamps are tightened evenly and securely. Realign pipes if necessary. Inspect coupling for damage and replace if found. |
| Difficulty sliding coupling onto pipe | Cold temperature making rubber stiff; pipe ends are rough or oversized. | Warm the coupling slightly (e.g., in warm water or sunlight). Smooth any rough edges on pipe ends. |
| Coupling appears loose after tightening | Incorrect coupling size for pipe OD; clamps not fully engaged. | Verify coupling size matches pipe outer diameters. Ensure clamps are properly seated in the grooves and tightened. |
Specifications
| Attribute | Value |
|---|---|
| Model Number | P1002-43 |
| Size | 4 x 3 Inch |
| Material | Stainless Steel (Clamps), Elastomeric (Coupling Body) |
| Brand | Fernco |
| Color | Black |
| Item Dimensions (L x W x H) | 8.04 x 8.04 x 5.76 inches |
| Connector Type | Coupling |
| Item Weight | 4.8 ounces |
| UPC | 018578000155 |
Warranty and Support
Fernco products are manufactured to high standards and are designed for durability. For specific warranty information regarding your P1002-43 coupling, please refer to the official Fernco website or contact their customer service directly.
For additional product information, technical support, or to explore other Fernco products, please visit the official Fernco Store on Amazon.





