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Dry-Pac Replacement for 4128-555 pumps
It is recommended that the Dry-Pac medium is replaced at intervals of 3 months
1. Unscrew Dry-Pac canister and remove
2. Refer to page 4 and follow the steps 8 to 11 after emptying out the old medium and
cleaning the canister where required.
3. Refit canister and ensure location arm is still in contact with shoulder
What is Dry-Pac?
Ambient air used by hand pumps contains varying amounts of moisture depending on
temperature and relative humidity. Dry-Pac is a patented method of extracting that moisture
before passing that air through our pumps
How does the Dry-Pac work?
As air is drawn into the pump it is forced to pass through and over a specially selected medium
that attracts and removes water molecules from air. This drier air is then passed through the
pump and the second integral micron filter in the normal way. The extraction is a one way
process and eventually the medium will become fully saturated and require changing. The Dry-
Pac should always be fixed in the vertical position but it can be rotated around the pump to the
desired position.
How long does the Dry-Pac medium last?
Our tests show that under average conditions the Dry-Pac medium will be effective for up to
four months. In warmer and humid climates, or for users who require optimum quality, we
recommend that the medium is changed every 2-3 months. Although the Dry-Pac medium
principally works with flowing air, it will continue to extract a small amount of moisture from
still air. Therefore, we recommend that the medium is also changed if the pump has undergone
prolonged periods of storage. We do not include any dye markers in the material as a visible
way to check how saturated the material has become. These are unreliable and can have
toxicity issues. If there is evidence of any moisture when the pressure relief screw is released
the material definitely needs changing.
Replacement of the Dry-Pac medium
The only replacement medium we recommend is the Hill medium (product code 062128-56).
This has been carefully researched and selected to give optimum performance. Do not attempt
to use or mix other absorbent materials such as silica gels or dyed markers. These products
have entirely different properties and will impair the correct functioning of the Dry-Pac.
Regeneration
There is currently no method of regenerating the medium in domestic circumstances. The medium
should always be replaced with a fresh sachet.
Do not
attempt to heat or microwave the medium.
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