Graco 231421 Instructions-Parts List Manual page 7

Setup
1/4 npsm(m) fluid outlet
33
Do not install any shutof f device here
64
Rotate clockwise to increase pressure
Shown in closed or spray position
28
Fill 1/3 full with TSL
74
52
32
102
67
Model 231421 Shown
7157A
Fig. 4