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Picture of Cheap DIY childs Playset tube/Tunnel
If you have ever priced a Play set tunnel, you know they are $500 + minimum.
I constructed this for about $20! 
Parts List:
10-  1"- 1/4" bolts
10- 1/4"  lock nuts
20 -  Washers
2- 55 gal plastic barrels (be cautios of former contents.  find food grade, or soap)
Mounting hardware: I used a spare swing, and lag bolts and washers.

Tools:
Drill
1/4' drill bit
jigsaw
ratchet and wrench

Step 1: Barrel Prep

Drill a pilot hole in the top.
Use the jigsaw to carefully cut along the inside rim.
Clean up the edge with sand drum on a drill or dremel, or an angle grinder .

Repeat with the second barrel. 
Sorry for the lack of picture on this step, I did this some time ago.

Next do the same to the bottom.  Be sure to leave about 1" around the edge to bolt together. 
I used a screw and a sting  as a compass from center. 
Sand these edges very well so kids don't get scratched.
 
carlos66ba3 years ago
Very nice! You are an awesome dad!
audioguy666 (author)  carlos66ba3 years ago
I try , thanks.