Stanley ProSet XT1 Blind Rivet Tool Instruction Manual page 3

Figure 3
STOP COCK
(USED DURING MAINTENANCE OF FILTER/
REGULATOR OR LUBRICATION UNITS)
3 METERS MAXIMUM
TAKE OFF POINT FROM SUPPLY
PRESSURE REGULATOR MAIN SUPPLY DRAIN POINT
AND FILTER (DRAIN DAILY)
Figure 4 Figure 5
90˚
Figure 6
6