Multi-Zone Outdoor Condenser Installation Manual
DURASTAR.COM18
PIPE EXTENSION BEYOND FLARE FORM
Outer Diameter of Pipe 
Inches (mm)
"A" Minimum Extension 
Inches (mm)
"A" Maximum Extension 
Inches (mm)
 0.25" (6.35mm) 0.0275" (0.7mm) 0.05" (1.3mm)
 0.375" (9.52mm) 0.04" (1.0mm) 0.063" (1.6mm)
 0.5" (12.7mm) 0.04" (1.0mm) 0.07" (1.8mm)
 0.63" (16mm) 0.078" (2.0mm) 0.086" (2.2mm)
 0.75" (19mm) 0.078" (2.0mm) 0.094" (2.4mm)
Flare form
Pipe
A
STEP 3: FLARE PIPE ENDS
Proper flaring is essential to achieve an airtight seal.
1.  After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials 
from entering the pipe.
2.  Sheath pipe with insulating material.
3.  Place flare nuts on both ends of the pipe. Make sure they are facing in the right direction as 
you cannot change their orientation after flaring.
Flare nut
Copper pipe
4.  Remove PVC tape from ends of pipe when ready to perform flaring.
5.  Clamp flare form on the end of pipe. The end of the pipe must extend beyond the edge of the 
flare form in accordance with the pipe extension table.










