3″ to 4″ (75mm-100mm) Blockage Removal Kit

This drain cleaning kit is designed for root intrusion and blockage removal in PVC or metal pipes. It includes a flexible shaft with a protective sleeve and drain cleaning chains. It will obliterate pipe blockages that your hydro jetter can not. Sewer cleaning chains in this kit have a drill head.

Drain cleaning kit for blockage removal in PVC pipes, will clean tuberculation and lime scale deposits in the drains.


This blockage removal kit is intended for clearing obstacles in 3” to 4” (75mm -100mm) pipes.

Depending on your selection, you can clear blockages in Cast Iron, Clay or PVC plastic pipes. (OR BOTH PVC AND CAST IRON)

It will obliterate solid blockages that your high pressure jetting machine struggles with. Root intrusion, cement, and even heavy scale can be ground up into manageable chunks which flow away easily and prevent further blockage somewhere down the line.

The tools are lightweight and compact, so you won’t find yourself lugging a heavy machine to get to your work area. They can be transported in an elevator and give more options when dealing with blockages in high rise buildings. (You need not be concerned that you might flood someone’s apartment, because this tool requires only enough water to wash away the ground up chunks.

Setting up is quick and easy because you only need to attach it to your drill, and you are ready to go.

Chains for PVC or Cast iron

Depending on your selection (PVC or Cast iron and clay pipes), the chains will vary.

The chains for PVC pipes do not have tungsten carbide bits fused to the cutting edge. This prevents damage to the PVC pipe wall. The PVC chains can be used in cast iron and vitrified clay pipes if needed, but they will work slower than the chains with hard metal bits fused to the cutting edge.

The chains for cast iron and clay pipes have tungsten carbide bits fused to the cutting edge which makes them more aggressive than the PVC chains.

Drill heads

Depending on your selection, you can choose the drain cleaning chains with, or without a drill head. The Croco drill head is fused to the front of the chain assembly, and is meant for forward cutting action like cutting roots, or grinding up a failed liner within a waste water pipe

The kit consists of

  • A flexible shaft with sleeve and friction rings.
  • A drill to shaft adapter.
  • Depending on your selection:
  • 3”(75mm ) Croco Chain (with or without Drill head, and with or without the tungsten carbide bits)
  • 4” (100mm)Croco Chain (with or without Drill head, and with or without the tungsten carbide bits)
  • If you choose both PVC and cast iron chains, we will provide you with the chains for PVC and cast iron (4 chain assemblies 2 x 3″ and 2×4″)

When you select the 8mm shaft, we automatically include the lightweight version of the chain. If you are looking for a heavy-duty chain with this kit, please get in touch with us and we will make you a custom order.


Clients report that they use this kit on day-to-day toilet blockages because the shaft is covered with a chemical and heat resistant sleeve which prevents damage to porcelain, BUT, we do not recommend using the 10mm (3/8″) or 12mm (1/2″) shafts  in a toilet system.


Besides blockage removal, this tool has the added advantage of being able to descale pipes, but it will not be able to descale pipes at the same rate as the kits made specifically for descaling pipes.

More about the chains

Each chain assembly is made up of three individual chains. The chains are made from stainless steel to prevent oxidation, and are fastened to the shaft with hex set screws.

Connecting your tools to your shaft with hex screws has a big advantage in that you can repair a kinked shaft quickly and easily as opposed to replacing the whole shaft.

The chains use centrifugal force to center the tool inside the pipe. This ensures that the entire inner diameter of the pipe is cleaned in the process.

More about the flexible shafts

The shafts are made from spring grade steel which is wound in opposing directions so that you get equal torque in both directions of rotation.

The shaft sleeve has friction rings to protect the ends from wear. The friction rings on each end prevent dirt from building up between the shaft and the sleeve. This allows more torque to pass from your drill to the tool end, and makes the system more efficient.

Before you order the longest length possible, consider this:

Most experienced users order the kit with a short shaft for everyday use; and a second shaft which they leave in the van. The advantage to this is that on a day-to-day basis, you will carry less shaft into your workspace. If you need extra length you can fetch your secondary shaft from your van and connect it with a shaft to shaft connector. 

Another advantage to having two separate shafts, is that should you accidentally kink the one you are working with, then you have a backup available immediately. No need to find your grinder to cut off the kinked section of the shaft before you can continue working.

Which shaft thickness should you choose?

The thickness of the shaft depends on the amount of bends that you would like to pass through. The more bends you need to get through, the thinner the shaft should be. However, the thinner the shaft is, the less torque the shaft delivers.

The 8mm (5/16”) flexible shaft is our second most flexible shaft. It has the ability to pass through multiple bends, and has more torque than the 6mm (¼). This shaft is most suitable for pipes with a diameter of 75mm (3”) to 100mm (4”), and will work with blockage removal chains as well as descaling chains.

The 10mm (3/8″) flexible shaft is less flexible than the 8mm (5/16) shaft, and yet more flexible than the 12mm (½”). This shaft will navigate through fewer bends than the 8mm (5/16) shaft, but will offer the user similar torque to the 12mm (1/2″). This shaft is suitable for pipes ranging from 75mm (3”) to 150mm (6”).

The 12mm (½”) flexible shaft is our most rigid shaft. This shaft is popular for failed liner removal since it offers the highest torque ratio. The shaft is perfect for descaling and blockage removal of lines ranging from 100mm (4”) to 250mm (10”)

Shaft shrinkage

When we manufacture the shafts we wind them in a long straight line. They are then wound onto a large diameter spool, and later cut into smaller pieces before we assemble them and deliver them to you. This means that when you first use your shaft, you might notice that the ends shrink a little. Usually this is more evident on the drill end.

This is perfectly normal since the shaft is subjected to the stresses of multiple bends and torque for the first time. After the first inner strands of the shaft settle into their permanent position the shrinkage will cease. Usually this affects around 3” (75mm) on either end of the shaft. When you notice this, simply cut off the shrunken section with an angle grinder, and reconnect your chains and drill. It is not necessary to weld the ends, but if you prefer to do this please try to avoid too much heat on the shaft.

Lubricate your shaft before first use

Aviation law prohibits us from delivering products which could be considered flammable so we send the shafts without lubricant in the sleeve.

Please be sure to lubricate your flexible shaft before using it, and then check the lubrication every few weeks. This not only ensures the longevity of your shaft, but also makes it more efficient over longer distances. Here is a video we made on how to lubricate your shaft:

Points to note:

The number of tungsten carbide  bits on top of the drill head will vary depending on the size of the chain that you choose. If you need a specific number, please check with us before you order.

These products are intended to be used by trained professionals in the sewer cleaning trade only. They do not come with instructions. If you would like training please make contact with us, and we will guide you.

Product pictures may vary in color and design depending on the size and diameter that you order.

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