Step 1: Step 1 : Materials and Tools
1. A Soda bottle
2. A sturdy pipe (thickness shown above)
3. A rubber grip
4. A Solenoid with a DC rating of 12 volts
5. A metal pipe (thickness shown above)
6. A rubber pipe with duct tape on both ends and a bolt that is the size of the opening of the solenoid valve
7. Zip ties
8. A trigger like switch
9. A hot glue gun
11. Tyre Valve
12. 9V Battery and a clip for it
Step 2: Air Valve
Firstly i drilled a hole in the bottom of the bottle and then take 2 wooden skewers glue them together and then take the valve and stick it into one end of the skewer and push it up the bottle with a little dab of hot glue on its brim so it can be sealed from the inside too and when the other end of the valve sticks out of the hole glue that end too. To get a tight seal.
Step 3: Gluing the Cap On
So first take the cap drill a hole in it and insert the pipe in it then tie cable ties on both ends then hot glue both end close the cap and then hot glue the seal of the cap and the bottle all shown above in the pictures.
Step 4: Reinforcement and Bottle's Pipe to Solenoid
Take 2 pencils and chop them so they are of the same size after that the pipe which is on the bottle chop it to a small size and wrap tape around it to thicken it like shown above then fit it into the solenoid valve then those pencils come into play glue them to the cap and then tape it. then glue the solenoid onto the pencils to give them support and now you've got a reinforcement for the solenoid
Step 5: Wiring and Barrel Into Solenoid Valve
2 leads will come out of the solenoid valve one will directly connect into the battery clip and the other will go into the switch and the other one of the battery clip will also go into the switch. As for the barrel insert the rubber pipe with duct tape and a bolt into the metal pipe and then your barrel is ready just tighten the bolt into the solenoid valve and voila! and then tape the barrel onto the pencils and then cover the whole metal pipe in tape too just for a cool finish.