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Frequently Asked Questions

What is a mole ?

Pneumatic_Piercing_Tool_NODIGMole_smallA mole is a soil displacement hammer, or Under Road Boring tool, or a Trenchless pneumatic piercing tool for installing telecommunication cables, fiber optic, electric cables, conduits and small pipes under roads, driveways and footpaths. Where you can't afford to disturb the surface, be it an expensive landscape or a busy road.

Going trenchless under roads, driveway, footpaths or landscape is the best alternative to the open trench method of laying electrical and telecommunication ducts. It has the main advantage of eliminating many re-instatement cost and traffic management bills by simply avoiding all these additional construction costs.

What is it for ?

Installing buried telecommunication cables, electric cables, conduits and small pipes the Trenchless way, under roads, driveways, footpaths & landscapes, where open trenching is costly or inconvenient. 

The Grundomat Under Road Boring tool or NODIG Mole, is a soil displacement hamer which is recommended for the NBN contractors in Australia. It helps installing the fiber optic cable ducts under residents driveway, footpaths, residents and city landscapes as well as small road crossing.

Who can use it ?

The Grundomat Under Road Boring piercing tool or NODIG Mole is so easy to use that nearly anybody can master it. Take a look a the HOW TO USE for an overview on how simple and easy it is to operate.

Professionnal contractors and individuals are taking the great advantages of installing ducts the Trenchless way.

If you are a contractor involve in the telecommunication industry, if you are installing NBN fiber optic, if you are a contractor for the plumbing industry and install house connections for water and gas lines, you should consider an Under Road Boring Mole. Clic here to buy!

If you are an individual who wants to install cables, reticulations and small pipes under your driveway, an established trees or under your wifes prized rose garden, you should consider using an Under Road Boring NODIG Mole.

It is fast, easy and very simple to use and you will save considerable time by going underneath instead of digging and destroying the lot.

When can I use it ?

Need to cross a road, a resident driveway, a footpath or an expensive landscape work ?

The Grundomat pneumatic piercing tool or NODIG Mole will help you realize that project. The Grundomat Under Road Boring or NODIG Mole tools allow you to pass that small pipe, cable or conduit under the road, driveway, footpath or landscape, the Trenchless way, and get rid of the re-instatement cost. Read more how a Grundomat Under Road Boring tool or a NODIG Mole can help you here.

How to use a mole?

How to use a soil displacement hammer?

How to install buried cables, conduits and small pipes without digging roads, driveways and footpaths?

Using one of our Mole is the easiest way to get rid of asphalt, concrete or landscape re-instatement cost. Follow those 3 simple steps to master the NODIG Mole in no time.




Dig the starting pit and the receival pit using a mini excavator or a shovel. The pits need to be at least 11 time the size of the diameter of the Mole. Leaving a minimum clearance of 10 time the size of the diameter of the mole on top of it.

Why a depth of 10 time the size of the mole ? Because those tools are some soil displacement hammers, they compact the ground as they go and the ground is more than likeley going toward the top of the mole and therefore push whatever is on top of it. Hence the creation of bumps on roads, driveways and footpaths when used too shallow. This suggested depth is the safest depth to assure you a success every bore and never risk to re-instate the surface.


Use the magnetic starting level to place the Mole perfectly aligned with the new pipeline to be installed, be electric cable or small water, gas or sewer pipe.


Connect the heavy duty hydraulic hose to the Mole and the Oiler. Then connect the air compressor to the Oiler. Turn the valve, from the Oiler, onto the 'On' position to power the Mole.

Method 1

If you have purchased a NODIG Mole Gold Package, you have the NODIG Hardened Pipe Coupling screw in the back of the NODIG Mole. In this case, put the first length of pipe over the hydraulic hose, from the Oiler side couplings, and screw the pipe in the hardened pipe coupling. The NODIG hardened pipe coupling will grip the new pipe and pulling it behind the Mole without any extra efforts for you.

Method 2

If you haven't purchased a Gold Package you might want to pull the new underground service once the NODIG Mole has broken through. In this case, attached the new pipe to the head of the NODIG Mole using a D-Shackle and towing socks or pipe pullers. Then reverse the NODIG Mole by using its built-in quarter turn reverse system :

Quarter Turn Reverse System HOW TO :

Twist the air hose by a quarter turn anticlockwise while the air is on. Pull it of about 50mm (until you can't pull further) and finally lock the hose by twisting it again by a quarter turn clockwise this time.


How often should I maintenance it ?

It is always a good idea to put the NODIGMole appart and clean it as often as possible.

Change the seals when they start to show signs of wear. More you will care of your NODIGMole, less often you will have to change the seals.

The NODIGMole Pneumatic Piercing Tool is such a strong and proven tool that you don't "absolutely" need to put it appart at a regular time. Because the NODIGMole is a piece of high quality and ultra strong steel, it is a kind of equipment that will last you for years to come.

What pipe and how big can be installed?

The table below show the maximum size and the type of pipe which can be install with each soil displacement hammer.

  • NODIGMole 45. 35mm dia max pipe size, at 450mm depth minimum. Perfec for Fiber Optic and electric conduits.
  • NODIGMole 54. 40mm dia max pipe size, at 540mm depth minimum. Perfec for Fiber Optic and electric conduits, small water pipe, drain pipe.
  • NODIGMole 65. 50mm dia max pipe size, at 650mm depth minimum. Perfec for Fiber Optic and electric conduits, small and medium water pipe, drain pipe, small gas pipe.
  • NODIGMole 76. 63mm dia max pipe size, at 760mm depth minimum. Perfec for Fiber Optic and electric conduits, small and medium water pipe, drain pipe, small gas pipe.

How do I care for my NODIG Mole

If you purchase the GOLD package, a toolbox is included with all you need for the first service including the first seal kit, adjustable spanners and the special NODIG Mole spanners for the correct disassembling and re-assembling.

Otherwise, you can bring your tool in our workshop, we'll maintenance it for you. Contact us to schedule an appointment! Don't forget to write the NODIGMole serial number (4 digits near the backend of the tool) in your message.