Things You'll Need
Instructions
Place a PVC cap face down on a work surface. Drill a hole through the center of the PVC cap with an electric drill. Insert a tire valve into the hole with the nipple facing up. Apply bonding glue around the hole and sides of the valve. Hold the valve in position for one minute. Let the glue set overnight.
Apply another application of the bonding glue and let the glue set overnight. Apply a line of silicone sealant over the bonding glue. Let three hours pass. Turn the cap over and apply the sealant around the valve. Turn the cap over and place it aside.
Place one of the PVC pipes horizontally on the work surface. Apply bonding glue around the rim of the left end of the pipe. Place the PVC cap on the pipe. Hold the cap on the pipe for a minute before letting go. Let the glue set overnight.
Wind a strip of Teflon plumber's tape around the rim of the cap. Smooth the tape down with your fingers. Repeat this procedure with another strip of the Teflon plumber's tape.
Apply a line of bonding glue around the rim of the cap. Let the glue set overnight. Apply a line of silicone sealant around the rim of the cap. Let three hours pass and then reapply the sealant.
Apply bonding glue around the rim of the right end of the pipe. Place the pipe valve over the end of the pipe with the valve pointing up. Hold the valve in position for one minute before letting go.
Wind a strip of Teflon plumber's tape around the rim of the valve where it meets the pipe. Smooth the tape down with your fingers. Repeat this procedure with another strip of the Teflon plumber's tape.
Apply a line of bonding glue around the rim of the valve. Let the glue set overnight. Apply a line of silicone sealant around the rim of the valve. Let three hours pass and then reapply the sealant.
Rotate the valve knob fully clockwise. Place the other PVC pipe horizontally on the work surface to the right of the valve. Apply bonding glue around the rim of the left end of the pipe. Place the pipe valve over the end of the pipe. Hold the valve in position for one minute before letting go.
Wind a strip of Teflon plumber's tape around the rim of the valve where it meets the pipe. Smooth the tape down with your fingers. Repeat this procedure with another strip of the Teflon plumber's tape.
Apply a line of bonding glue around the rim of the valve. Let the glue set overnight. Apply a line of silicone sealant around the rim of the valve. Let three hours pass and then reapply the sealant. Screw the bicycle pump nozzle onto the tire valve nipple. Take the air cannon you have just made into your backyard.
Hold the pipe so that the open end is up. Drop a ping-pong ball into the open end. Place your air cannon on the ground with the open end facing a bush and the pipe valve knob facing up. Place a paperback book beneath the front of the pipe so that the barrel is at an angle. Pump the bicycle pump until the gauge reads ̶0;100.̶1; Rotate the knob counterclockwise to shoot the ping-pong ball.