How to Make a PVC Pipe Water Cannon

Written by cathy conrad
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How to Make a PVC Pipe Water Cannon
Water cannon (freerangestock)

Water wars are a refreshing way for kids to stay active and cool on a hot summer afternoon. Forget about the water pistols of days past. The new "weapon" of choice for water wars is a water cannon--provided the water pressure isn't too high. You can make your own water cannon with PVC pipe or try making a few and getting the neighbourhood kids together for hours of good, wholesome summertime fun.

Skill level:

Things you need

  • 2 feet of 1 ½-inch diameter PVC pipe
  • 1 ½-inch end cap
  • 3 inches of 1-inch PVC pipe
  • 2 ½ feet of 1-inch wood dowel
  • Rubber O-ring
  • Pipe glue
  • Hacksaw
  • Drill
  • Tape measure
  • Sandpaper

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  1. 1

    Cut your 1 ½-inch PVC pipe to 2 feet in length with the hacksaw. Trim and sand the edges smooth. Drill a ½-inch hole in the middle of the end cap, starting small so you can determine how far you want the water to shoot. If a larger opening is desired, drill a larger hole.

  2. 2

    Glue the end cap to one end of the PVC pipe with pipe glue. Allow to dry for 20 minutes.

    How to Make a PVC Pipe Water Cannon
    End cap
  3. 3

    Insert the wood dowel into a 3-inch length of 1-inch PVC pipe and apply glue. Allow to dry for 20 minutes.

    How to Make a PVC Pipe Water Cannon
    Wood dowel
  4. 4

    Make your plunger by rolling the O-ring over the 1-inch PVC pipe containing the dowel. This will keep water from leaking around the pipe.

    How to Make a PVC Pipe Water Cannon
  5. 5

    Push the plunger you made in Step 4 all the way into the open end of the larger pipe--O-ring end first, which will minimise water leakage. The O-ring will create a rubber gasket between the two pieces of the water cannon.

  6. 6

    Submerge the end cap of your water cannon in water and pull back on the wood dowel to fill the tube. Aim your water cannon and push the dowel in as hard as possible.

Tips and warnings

  • Decorate your new water cannon with paint.
  • Don't spray anyone directly in the face.
  • Don't spray animals.

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