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Fernco Donuts sewer pipe compression joint sealers. |
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Fernco Donuts are flexible PVC donut-shaped rings for compression sealing of sewer pipe joints and drain waste and vent connections such as sockets, hubs, bells, and spigots. They offer all of the properties necessary to create a good, lasting joint. Fernco Donuts are made from strong, resilient, chemical-resistant elastomeric PVC specially formulated for use as a sewer joint material. Because of the inertness and chemical resistance of the material, Fernco Donuts are impervious to soil conditions, sewage and water in the carrier pipes, and to normal sewer gases. |
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In fact, its combination of compressibility, resiliency, chemical and fungus resistance, and ultraviolet
stability create a superior joint!
A bearing surface is provided by filling the annular space (between the pipes being joined) with the donut. This supports the spigot and distributes the earth load over a larger area of the external pipe. |
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The donut is designed to provide several points of seal in order to accommodate possible irregularities
in the pipe surfaces. If one seal point iss disturbed, the others will maintain the seal.
The design and elasomeric material of the Fernco Donut both contribute to sewer joint permanence even under common conditions of ground movement and expansion and contraction of the pipes themselves. Sewer pipe companies do not manufacture their pipe to common dimensional standards. Instead, pipe is produced to the designs and dimensions best suited for each particular sewer system. Because of this, variations in dimensions of pipe bells, hubs and bores are simply too great to permit making a single universal connector. |
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How to Order If you do not know the part nuumber, you can order by description; giving size, material and type of connection you want to make. Donuts require specific information on the manufacturer of pipe. Our sales coordinators are trained to assist you. Donuts can also be ordered by dimensions. Donuts seal by compression and have much less dimensional range than couplings. The bell, hub or socket dimensions must be given within 1/32" accuracy. Consequently, Fernco Donuts are available in hundreds of sizes and configurations for use with most brands and types of piping material. Each is designed to fit the basic configuration and dimensions for the type of joint being made, based on the specifications received from various pipe producers...specifications which often are changed arbitrarily and without notice. Caution: A donut that has too loose or too tight a fit could result in a bad joint. Contact Fernco for proper donut selection. |
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Fernco Donuts - How to Install |
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Tolerances of any pipe may be greater than the effective range of Donuts. Since Donuts seal by compression
in the annular space between pipes being connected, considerable force (30 psi) must be exerted on the
sealing surfaces during installation.
It is important to be aware that the sealers may not function as intended due to improper or insufficient description of the pipes being conneted or changes in pipe dimension or design by the various manufacturers. Important Pressure test before backfilling or concealing. Typical Fernco Installations
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This method is used when the Donut has a wall thickness of 3/8" or greater. 
Donut quarter section view. Donut has thick wall - no stop flange.
Insert spigot through center of donut approximately 1½"
Make sure the bell is clean and free of debris.
Lubricate the outside of the donut with a soap solution.
Insert donut and spigot assembly into opening. Drive donut with hammer and wedge until fully seated.
Test joint to engineer's specification. Pressure test before backfilling or concealing. Bed and backfill
properly.
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