replacing sewage waste pipes underground (is flexible ok)

[dandt]

recently my downstairs toilet developed a problem/blockage which fortunately was before our main sewage pipe for everything else
Anyway unfortunately I got a clearing rod plus tool stuck in the pipe and had to smash piping from underground in neighbours garden to get it out.
I was amazed by the price of osma fittings and so have used a couple of less thick flexible piping (the £20 type). Its all nicely sealed and cant go anywhere and neighbours garden restored. My question is this:

these fittings are definitely for the back of toilet to waste pipe but are they suitable for outside or will they have worn within a couple of years.

Not to worry if they do because I would lay piping in an alternative route to my main pipe but NOT under neighbours garden.

I would just like some assurance as to whether Ive done an ok job or a complete bodge.

thanks

 

[Nige F]

well ground pressure causes pitch fibre to become oval in about 20-30 yrs. so a couple of years and you flexi should be fluxey

 

[dandt]

thanks for reply...
to be clear pipe concerned is only 1/2 to 1 foot below ground
protected by cement / bricks and wood over the top (ie even if someone stands there they will be standing on wood and the pipe should feel a thing
Back of terrace so no vehicles and unlikely that anyone would even stand there
I'm more concerned about internal wear over time and temperature outside etc
thanks