MSA ExtendAire II User Instructions Download Page 8

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Remove the old dust cover by sliding it down the hose and away
from the manifold.

Install the new dust cover by sliding the dust cover over the hose
until it reaches the manifold end of the hose assembly. Verify that
the dust cover orientation is correct by placing the dust cover
over the quick-connect fittings.

Feed the hose through the pouch and through the hose restraint.
Verify that the hose restraint is securely attached to the backplate.

Before installing the hose into
the first stage regulator, replace
the o-ring on the hose fitting
with the new o-ring provided in
the replacement kit. Apply
Christo-Lube to the o-ring. Insert
the hose into the first stage
regulator and replace the lower
u-clip.

Install the PR14 First Stage Regulator into the bracket. Install two
(2) new screws and tighten to 35-45 in.lbs.

Replacing the Pouch

To replace the pouch, the ExtendAire II Pouch Kit, P/N 10111404, is
required.

The ExtendAire II emergency breathing hose does not need to be
removed from the first stage regulator in order to replace the pouch. To
install the pouch, refer to the

Installing the ExtendAire II Intermediate

Pressure Accessory Kit

section of this manual.

Replacing the Hose Restraint

To replace the hose restraint, the ExtendAire II Hose Restraint Kit, P/N
10111405, is required.
1.

Remove the two (2) screws in the first stage regulator bracket and
remove the PR14 First Stage Regulator. Do not remove the
regulator bracket from the backplate. Discard the screws.

Remove the lower u-clip and the ExtendAire II emergency
breathing hose from the PR14 First Stage Regulator.

Slide the old hose restraint down the hose and away from the
manifold to remove. Remove the hose restraint from the
backplate and discard.

Feed the hose through the new hose restraint. Connect the hose
restraint to the backplate.

NOTE:

Be sure that the hose restraint orientation is correct. The

orientation varies depending on the lumbar pad configuration. Refer to
the

Installing ExtendAire II Intermediate Pressure Accessory Kit

section of

this manual for additional help.

Before installing the hose into the first stage regulator, replace the
o-ring on the hose fitting with the new o-ring provided in the
replacement kit. Apply Christo-Lube to the o-ring. Insert the hose
into the first stage regulator and replace the lower u-clip.

Install the PR14 First Stage Regulator into the bracket. Install two
(2) new screws and tighten to 35-45 in.lbs.

Replacing the Hose and Manifold Assembly

To replace the entire hose and manifold assembly, the ExtendAire
II Manifold and Hose Assembly Kit, P/N 10111406, is required.

If it is desired to salvage the quick-connect fittings and reuse them
on a new hose and manifold assembly, the ExtendAire II
Manifold and Hose Assembly, Less Fittings, Kit, P/N 10111407, is
required.

To install the hose and manifold assembly, refer to the

Installing the

ExtendAire II Intermediate Pressure Accessory Kit

section of this manual.

To reuse the quick-connect fittings on a new hose and manifold
assembly:
1.

Secure the manifold with a wrench or vise.

Remove the quick-connects using a 7/8” wrench.

Remove the o-ring from each quick-connect fitting, discard the o-
rings.

Apply a small amount of Christo-Lube to the new o-rings
provided with the kit.

Cover the threads of the quick-
connect with a thread protector,
tape, or paper to protect the o-
ring while it is installed on each
of the quick-connect fittings.
Slide the o-ring over the threads
and remove the thread protector
tape or paper.

Tighten each quick-connect fitting to 70-75 in.lbs.

Replacement Parts

ExtendAire II Dust Cover Kit

10111351

Dust Cover and Supporting Replacement Supplies

ExtendAire II Pouch Kit

10111404

Pouch

ExtendAire II Hose Restraint Kit

10111405 Hose Restraint and Supporting Replacement Supplies

ExtendAire II Manifold and Hose Assembly Kit

10111406 Complete Manifold and Hose Assembly