Infinity 6250LQ Operation Manual page 21

8、F Connector
Incoming Ink
4、Handle
2、F End
Air Valve：
1、 M End（Input） ：Air input
2、 F End（Output） ：Air output
3、 F End (sealed)：Sealed by tube cap
4、 Handle：Handle's direction means the line closed
Valve Position：
FY operation manual
9、Tube Cap
Figure 6-5 Ink Supply and Cleaning System（Front)
Figure 6-6 Air Valve
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Print head
1、M End
3、F End (sealed)