Aqua Lung Airsource 3 with Cut-off Valve - Manual (Page 9)

9 Airsource Owner's Manual
7. hold the lower molded hose and Trim grip steady, engage the Airsource
lower assembly by lining up the upper and lower connection points (figure
6a) and carefully turning clockwise 1/4 turn (figure 6b) until it snaps into
place (figure 6c).
Figure 7
Figure 6b Figure 6a Figure 6c
8. slide the medium pressure (MP) hose into the upper (figure 7) and middle
hose guides.