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Fernco 1059-33 3 in. x 3 in. PVC Plastic Socket to Plastic Pipe Flexible Coupling
Manufacturer Resources
Product Specs
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Couplings
- Product Type:
- Flexible Coupling
Fernco 1059-33 – Frequently Asked Questions
1) What does the Fernco 1059-33 flexible coupling connect?
The Fernco 1059-33 joins a 3 inch PVC plastic socket to 3 inch plastic pipe. One end goes over the pipe, the other seats into the socket fitting, and the rubber sleeve with clamps takes up the difference between the two. It is a 3 x 3 coupling, so both sides are sized for 3 inch.
2) Will a Fernco 1059-33 work to tie 3 inch PVC drain pipe into a cast iron or clay line?
No. The 1059-33 is built for a 3 inch plastic socket on one side and 3 inch plastic pipe on the other. Cast iron, clay, and ductile iron run to different outside diameters than plastic at the same nominal size, so a plastic-to-plastic coupling will not seal reliably on them. For a dissimilar-material joint, order the Fernco transition coupling that names both materials and both pipe types on its label.
3) Is the Fernco 1059-33 for DWV drain lines or can I use it on pressure water pipe?
Drain, waste, and vent only. Fernco rubber couplings like the 1059-33 are non-pressure fittings for gravity drainage; they are not rated for supply-side water pressure. If the line is pressurized, use a solvent weld or a mechanical pressure fitting instead.
4) What is the difference between a socket-to-pipe coupling like the 1059-33 and a standard pipe-to-pipe Fernco?
A standard flexible coupling sizes both ends for pipe outside diameter. The 1059-33 has one end sized to enter a PVC hub or socket fitting and the other sized over 3 inch plastic pipe. Use it when you are coupling directly into the bell of a fitting rather than to a cut pipe end. If both sides are cut pipe, the plain 3 x 3 pipe-to-pipe coupling is the one you want.
5) Do I need to solvent weld or prime anything to install a Fernco 1059-33?
No glue, no primer, no heat. The 1059-33 is a mechanical rubber coupling: slide it on, seat both sides, and tighten the clamps with a nut driver or torque wrench. That makes it the usual choice for a repair cut-in or a tie-in where you cannot dry-fit and rotate the pipe.
6) Can a Fernco 1059-33 be buried or used underground?
Rubber shielded and unshielded couplings are commonly used on buried DWV, but the coupling has no structural strength of its own. The trench has to be bedded and the pipe supported on both sides of the joint so the coupling is not carrying load or shear. Do not use it to span a gap or to hold misaligned pipe in place.
7) What part number do I order for the Fernco 3 inch socket to pipe coupling?
Order Fernco 1059-33. That is the manufacturer part number as well as the model designation, and it covers the 3 inch socket by 3 inch pipe configuration. There is one configuration under it, so there is no size or material option to specify.
How fast can I get the Fernco 1059-33 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
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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 1059-33 come with a warranty?
Absolutely. The Fernco 1059-33 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 1059-33?
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