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K-20 k-220 O-rings. These pumps use 6 O-rings total.
For the High Volume Stage (Outer Pump).
The Larger 2.5" diameter o-ring (part # 6331) goes on the plunger end and creates the air seal. This o-ring requires light lubrication. The other 2 o-rings are the same size/part number. These 2" diameter o-rings (part # 6326) act as cushions or cap seals. One can be seen from the outside of the pump and acts as a bumper/cap seal on the down-stroke and the other is inside the pump on the plunger shaft and acts as a bumper on the up-stroke.
For the High Pressure Stage (Inner Pump).
The Larger 1.5" diameter o-rings are (part # 6320). One goes on the plunger end and creates the air seal. This o-ring requires light lubrication. The other 1.5" o-ring is located at the top of the plunger shaft under the pump handle and seals the pump when locked. This o-ring can been seen from the outside of the pump. The smaller approx. 1.25" o-ring (part # 6215) is located on the plunger shaft and acts as a cushion or bumper on the upstroke.
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