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MIL-P-8258D(AS)
Design and construction.  The pump and hose shall
3.4
conform  to figure 1.
The pump shall be so constructed that no parts
will work loose in service.
It shall be built to withstand the strains,
jars, vibrations, and other conditions incident to shipping, storage,
installation and service.
3.4.1
Maintenance.
The pump shall be so designed and
constructed that the barrel, plunger or check valve may be replaced
without special tools or damage to the pump and so that adjustment and
repairs can be made readily by the personnel of operating units and
overhaul bases.
3.4.2
Barrel .
The barrel shall be black, paper-based
phenolic laminated tubing, type PBG, conforming to MIL-P-79.
3.4.3
End plates.
The pump shall be provided with a lower
The opposite end
plate incorporating an air outlet and a check valve.
of the pump shall be provided with an upper plate incorporating an air
The plates shall be held
inlet and a passage for the plunger stem.
firmly against the ends of the pump barrel by three rods or 3/8-inch
The
wide bands evenly spaced around the circumference of the barrel.
lower end plate shall be sealed against the barrel by means of a synthetic
rubber gasket.
The air discharge outlet
Air discharge outlet.
3.4.4
shall consist of an externally threaded outlet for attachment of the
pump hose.  The outlet shall project beyond the face of the end plate as
The inner diameter of the opening through the outlet
shown in figure 1.
The externally threaded outlet of the
shall be 1/2 + 1/32, -O inch.
pump shall be provided with 13/16-20 UNS-2A threads.
The check valve shall be of synthetic
3.4.5
Check valve.
The valve shall seal against a
rubber or any other suitable material.
The check valve shall be
reverse flow of air when the pump is operated.
an integral part of the lower end plate or shall be installed in a
separate plate adjacent to the lower plate.
Plunger  assembly.
The plunger assembly shall consist
3.4.6
of a handle, stem, and piston.
Handle .
The handle shall be approximately 3 inches
3.4.6.1
long and l/2-inch wide and shall be securely fastened to the stem.
The
Screws or rivets, if used for this purpose, shall be countersunk.
edges of the handle shall be rounded and smooth.
Not less than a l-inch
clearance shall be maintained between the handle and the upper end
plate.
3.4.6.2
The stem shall be constructed of tubing
Stem.
having an outside diameter of not less than 3/8-inch and sufficient wall
thickness to prevent bending if the pump is operated roughly.
The stern
4
.

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