Agronomy Journal -- Prior et al. 98 (1): 120 Figure IG3

Click on image to view larger version.

Fig. 3. Schematics of trigger mechanism: (A) pneumatic cylinder, (B) pipe nipple [3.2 mm (0.125 in)], (C) needle valve, (D) pipe nipple [3.2 mm (0.125 in)], (E) trigger valve, (F) male to female 90° pipe elbow [3.2 mm (0.125 in)], and (G) male hose plug [3.2 mm (0.125 in)] to connect to source air coupler.