piston gun question

[roughboy]

If you buy a sprinkler valves it has an arrow on the bottom telling you which way the air flows to.So my question is if im going to put a modded sprinkler/blowgun onto the back of my piston gun as the trigger where should the arrow face to? is it going to face the same way as the barrel or face were i will be, at the back? thank yous!!


one more ?-
which pvc can handle more pressure?
sch40 or sch80

[keep_it_real]

Put the arrows facing the opposite way of the barrel if it's inline. Since you want the piston to move backwards you set the sprinkler valve backwards.

sch80 holds a lot more pressure but sch40 is perfectly safe for most pneumatics. With a sprinkler valve I wouldn't go past 120 and sch40 can definitely hold that.