Latest product launches

DRAINBLOCK BAG - for remotely sealing off disused drains or sewers

Posted: Wednesday 3rd October 2007

Steve Vick International Ltd, specialists in pipe sealant techniques in the gas industry, has introduced a new product for the waste water market. Known as DRAINBLOCK BAG, the new system allows a disused lateral to be sealed off, remotely, at the point where it joins the downstream drain or sewer.

The system uses a twin fabric bag containing an expanding polyurethane resin foam, and is based on a technique which the company initially developed some 25 years ago for use in the gas distribution industry. This technique has become an industry standard method of flowstopping gas mains and services.

The major advantage of the DRAINBLOCK BAG is that it is positioned from an access point up to 15 metres away from the joint with the main. This avoids the need to excavate in the highway a particular benefit at busy junctions and other sensitive locations.

DRAINBLOCK BAG prevents ground water from entering sewers, stops the passage of odour and discourages the movement of rats and other vermin. The entire lateral can be filled behind the bag, if required, thus avoiding unauthorised connection to clean water drainage systems.

The development of DRAINBLOCK BAG follows the continuing success of a product which Steve Vick International markets in Denmark called RATSTOP. This was introduced some years ago in response to the requirement to prevent the passage of vermin in disused drains and sewers. RATSTOP bags are filled with a specially formulated grout which is resistant to rats. The product is approved by the Danish government.


A CCTV camera is used to locate the optimum position in which to place the DRAINBLOCK BAG and to monitor the expansion process. Once the desired location has been determined, the foam and hardener are mixed together in a sealed sachet and zipped inside the porous retaining bag together with a piercing knife. This bag is then zipped inside an outer bag made of non-porous and semi-porous materials. The prepared DRAINBLOCK BAG is immediately pushed into place with the aid of drain rods attached to a tube on the bag.

As the foam begins to expand, the knife pierces the sachet allowing the foam to expand into the inner bag. As expansion continues, it seeps through this bag into the outer bag. At full expansion, the foam fills the outer bag and small quantities pass through the semi-porous panels to adhere to the walls of the pipe forming a permanent plug.

DRAINBLOCK BAG starts to act as a seal against water and odours in approximately 30 minutes depending on the ambient temperature. A full cure will be achieved in 12 hours.

DRAINBLOCK BAG is designed for use on clay, concrete and plastic pipes up to and including 6/150mm diameter. Available in kit form, it is ideal for use by Council contractors, water and sewerage companies, and facilities management and maintenance teams.

DRAINBLOCK BAG has been tested to resist a head of water up to 5 metres in height and is approved by WRc. It meets the requirements of The Drain Repair Book 2nd Edition and the Civil Engineering Specification for the Water Industry 6th Edition. A patent has been filed for the DRAINBLOCK BAG.

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