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Section 5.1: Staging the EST Extensions
• From the pole box, identify the upper and lower EST extensions (PN 70-2019-01 & 70-2020-01 respec-
tively) and set on a clean and dry surface.
• From the BigIR Mark IV Hardware/Heat Shrink kit (PN 72-0044-04) remove the following components:
• On the lower EST (PN 70-2019-01):
- Slide one O-ring from the end opposite to the aluminum coupler, and butt it against the coupler to
make a seal on the joint (figure 5.1).
- Slide one piece of Polyolefin heat shrink tubing directly behind the O-ring in preparation for sealing.
- Now the hose clamp can be slid over the pole, about halfway down.
- Follow with the final piece of heat shrink tubing, as well as the final O-ring
• On the upper EST (PN 70-2020-01):
- Slide one O-ring from the end opposite to the aluminum coupler, and butt it against the coupler to
make a seal on the joint.
- Slide one piece of Polyolefin heat shrink tubing directly behind the O-ring in preparation for sealing.
Figure 5.1
PREPARE THE EST EXTENSION ASSEMBLY
QTY Part Number Description Key
3 10-1104-11 O-Ring, 1-3/4"
A
1 60-6000-20 Hose Clamp, 1.16” - 2” ID, SS
B
3 10-1059-11 Polyolefin Heat Shrink 2.05” x 4”
C
PN 70-2019-01
PN 70-2020-01
A
A
A C
C
C B
Note: O-ring is black in
color, it is only shown in
orange for contrast.
Note: Lower EST does
not have reinforcing ring
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