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Zurn PEX
®
Plumbing Installation Guide
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
Variation in ring diameter (out-of-round) should not exceed 0.006”.
1. Measure and cut the tube. Be sure you have a square burr-free
cut. An uneven or jagged cut may cause an improper connection.
Making the Connection with the Medium Crimp Tool
Note:
Use the crimp tool only to install PEX tube/fitting systems meeting ASTM F1807 for brass or copper insert fittings and
F2159 for plastic insert fittings.
Important:
Always refer to the tube manufacturers’ product assembly instructions when using the crimp tool.
2. Next, slip a copper crimp ring onto the tube. Do not use
hose clamps!
3. Now insert the fitting into the tube up to the fitting shoulder.
Position the crimp ring 1/8 inch to 1/4 inch from the end of
the tube. An improperly positioned ring may produce a weak
connection. Ring may be squeezed to hold it in place until
step 4 is completed.
4. Position jaws squarely around the ring. Release upper handle to
close jaws on the ring. Squeeze handles together to complete
the crimp.
5. Pull back on moving handle to release jaws from crimped ring.
6. Measure the crimped ring with Zurn “Go/No-Go” gauge. See
table below. Do not measure bumps on ring where jaws met.
If “Go” on gauge does not fit, or if “No-Go” does fit, then cut
out connection, replace fitting and ring, adjust and calibrate
the tool, and recrimp.
The following dimensions are the ASTM maximum and minimum
crimped ring diameters for crosslinked polyethylene (PEX) pipe
installations.
1/8¨ to 1/4¨
Crimp Ring
Spacing
Fitting
Shoulder
1/8¨ to 1/4¨
Crimp Ring
Spacing
Fitting
Shoulder
1/8¨ to 1/4¨
Crimp Ring
Spacing
Fitting
Shoulder
1/8¨ to 1/4¨
Crimp Ring
Spacing
Fitting
Shoulder
Standard Tube Size >
3/8
”
1/2
”
3/4
”
Minimum Diameter
0.580”
0.700”
0.945”
Maximum Diameter
0.595”
0.715”
0.960”
