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Fernco 1056-54RC 5 in. CI/PL x 4" CI/PL Strong Back Shielded PVC Coupling
Manufacturer Resources
Product Specs
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Pipe Fittings
- Product Type:
- Flexible Coupling
Fernco 1051-43 – Frequently Asked Questions
1) What pipe types and sizes does the Fernco 1051-43 coupling connect?
The Fernco 1051-43 joins 5 inch cast iron or plastic pipe on one side to 4 inch cast iron or plastic on the other. The CI/PL designation on both ends means each side is sized to the outside diameter of either cast iron or plastic (PVC/ABS) DWV pipe of that size, so you can go cast iron to plastic, plastic to plastic, or cast iron to cast iron across the joint.
2) Can I use the Fernco 1051-43 to reduce from 5 inch to 4 inch drain pipe?
That is exactly what it does. It is a reducing coupling, 5 inch on one end and 4 inch on the other, so it makes the size transition and the joint in one fitting. No separate reducer bushing is needed.
3) Will this Fernco coupling work on a 4 inch PVC to 5 inch cast iron repair in a buried sewer line?
Yes, that is the pairing it is built for. The 5 inch end takes the cast iron, the 4 inch end takes the PVC, and the shielded Strong Back body handles the shear at the joint that a bare rubber coupling would not. Both ends are cut to outside diameter, so verify your existing pipe is nominal 5 inch cast iron and nominal 4 inch plastic DWV before you cut it in.
4) What is the difference between a shielded strong back coupling and a plain rubber no-hub coupling?
A plain flexible coupling is rubber with two clamps and relies on the surrounding soil or hangers for support. The Fernco 1051-43 is a shielded Strong Back type, meaning the sleeve is wrapped in a stainless shear ring/shield that resists shear and bending at the joint. That is what makes it acceptable where the joint has to carry load or stay aligned, such as buried runs or unsupported spans between fixtures.
5) Is the Fernco 1051-43 a pressure fitting or for drain lines only?
It is a flexible coupling for drain, waste and vent work, not a pressure fitting. Sizing is given in CI/PL DWV terms, 5 inch to 4 inch, and flexible shielded couplings of this kind are used on gravity drainage and sewer piping.
How fast can I get the Fernco 1051-43 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Fernco 1051-43 come with a warranty?
Absolutely. The Fernco 1051-43 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Fernco 1051-43?
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product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Fernco 1051-43 from ZenSupply?
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and
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