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I have seen Walkway Tunnel Kits being sold in the US, unfortunately I can't find a similar product in the UK. Are there alternative products or methods, that can be used when a product like this is not available?
I have tunneled under a concrete pad using lengths of rigid pipe, a hose, and lots of dedication.
You dig a substantial hole on both sides, then you put the hose in the pipes with a pressure nozzle, then you hammer the pipes through the ground and put them together as you need length.
Required, but never shown