SunStar SPS/D-B1201 SERIES User Manual page 18

(3) How to connect the air hose of the monolithic driven presser foot
1. Connect the filter regulator and the solenoid valve
together with a hose①.
2. Insert the hoses with "S3F" and "S4F" labels into A
and B as shown in the Figure. Put in the hoses deeply.
3. Use the quick couplings② to connect S3L and S3R
and S4L and S4R.
4. Connect the solenoid and the power switch connector.
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[Figure 23]