Installation Instructions

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.
Fernco Donuts - How to Install
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
z Same Size - Same Material
z Same Size - Different Material
z Different Size - Same Material
z Different Size - Different Material
z Seal against infiltration.
z Connect material to material or
material transitions.
z Adapt size to size or increasing size -
1¼" through 12"
Drive Method
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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