This is a complementary instructable to the No Weld Bike Trailer. This instructable will show you a quick air hose coupling based trailer hitch, that connects to that trailer.

Step 1: Supplies

The supply list for this hitch is well under 5 bucks, here is what i used:
1 Male Airhose coupling
1 1/4" bolt
1 1/4" nut
1 U bolt (1 and 1/4")

Drill
Drill bits necessary to complete the job.

Step 2: Drill the Ubolt Plate

Most Ubolts will come with a metal plate, Drill into this with a standard drill bit about 1/4"

Step 3: Put the Bolt and Nut On

Put the nut on the bolt and the put the bolt through the metal plate like the picture below.

Step 4: Thread the Airhose Coupling On

Thread the airhose coupling onto the bolt, Use 2 wrenches to tighten everything down sufficiently.

Step 5: Put It on the Ubolt

Put the bolt onto the ubolt like so:

Step 6: Attach to the Seatpost

Lastly attach the hardware to your seat post and ride! If you don't want to scratch your bike seat post, wrap it in an inner tube. Use a crescent wrench to tighten it down.