The picture shows the main pump head parts.

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Figure: Overview of pump head parts

No.

Description

1

Pump head

2

Inlet check valve

3

Piston seals

4

Support rings

5

Pump head seals, for seal wash plate screws (O-ring seals 6.5x1)

6

Pump head seals, for seal wash plates (O-ring seals 11x1.5)

7

Seal wash plates

8

Screws, seal wash plates

9

Seal wash seals

10

Pistons

11

Connectors for seal wash tubing (screwable)

12

Outlet check valve

13

U-tube