Using 4 steel radiator like bands, I replaced a section of underground lawn sprinkler black plastic pipe that runs over a septic drain field.    Repair couplers do not leak until i press my foot down on one of four running sprinkler heads.  Is that normal?  [Would the leak have been due to the hair dryer i used to make the plastic pipe more pliable?](http://diy.stackexchange.com/questions/66559/is-it-ok-to-use-a-hair-dryer-on-underground-lawn-sprinkler-pipe)

Hoping someone has tried the same stress test and would share their experience.


Water pressure where I live is 85psi, but noticed most water garden hose accessories sold locally are rated to only 60psi.


  [1]: http://diy.stackexchange.com/questions/66559/is-it-ok-to-use-a-hair-dryer-on-underground-lawn-sprinkler-pipe