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ZURN PEX, INC.
HIGHWAY 11 EAST, COMMERCE, TEXAS, U.S.A. 75428 • PHONE: 855-ONE-ZURN (855-663-9876) • FAX: 903-886-2583 • www.zurn.com
Zurn PEX
®
Plumbing Installation Guide
7. Release and remove the removal clip.
8. Check to see that the long side of the coupling still has sufficient
engagement with the tube. The depth mark will either be non-
visible because it is inside the fitting or it will be within ¼” of the
end of the fitting if it is visible.
Installing the Polybutylene (PB) Transition Coupling
The Polybutylene Transition Coupling is a fitting designed to allow
transition from polybutylene tube in an existing installation to PEX,
CPVC or copper. Like PEX, a Z-Bite connection for polybutylene tube
requires a tube liner. The portion of the liner that fits inside the tube
for polybutylene will be slightly larger than the liner for the same size
PEX tube. Use of a PEX liner in the polybutylene tube may cause a
failure of the connection and subsequent water damage.
1. The end of the coupling containing gray polymer insert is the end
to be used with the polybutylene tube.
2. Using a blade-type tube cutter, cut the end of the polybutylene
tube square.
3. Examine the end of the tube for any scratches, gouges, or lines
that might prevent the o-ring from sealing on the surface of the
tube.
4. Using the deburring tool, chamfer the outer edge of the cut tube
end and mark the insertion depth on the tube.
5. Insert the polybutylene tube into the polybutylene end of the Z-Bite
fitting until it bottoms out in the fitting socket. Some resistance
can be expected as the end of the tube moves past the teeth on
the retaining ring and o-ring seal. The mark for insertion depth
should visible approximately 1/8” from the end of the fitting.
6) Follow the earlier instructions for making Z-Bite connections with
PEX, CPVC or copper on the other end of the transition coupling.
Warning and Limitations
Zurn Z-Bite fittings are not intended for and must not be used in the
following situations:
1. Any application for any type of fuel, either liquid or gas.
2. With any tube of multi-layer construction including barrier tubes for
radiant heating. Z-Bite fittings do not seal the ends of the tube and
liquids may penetrate between the layers and cause a failure.
Making the Connection with Z-Bite Fittings
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