Drain and Flood protection devices that include pneumatic bags and automated flaps that can be controlled manually and wirelessly. Preventing illegal run-offs in time of spillages and fire.

Industrial Drain Blockers

Industrial Drain Blockers 400

Where large amounts of water are fed into the drainage system, these drain blockers cannot only save the environment but prevent huge fines.

The drain blocker and Telestopper are an innovation that blocks a drain or pipe either to stop harmful liquids entering the drainage system or to stop the drainage system from entering the premises in events such as floods. The device quickly inflates a rubber bladder that blocks the drainage pipe and as the bladder is on the end of a pole you do not need to worry about getting your hands contaminated. The Telestopper is available for domestic and commercial use.

telestopper drain blocker for domestic use

Domestic Drain Blocker

commercial drainage blocker

Commercial Wall-mounted Drain Blocker

Industrial Bladders range from 50 mm - 2" inches to 600 mm 24" inches whilst the domestic version bladders are from 50 mm - 2" inches to 400 mm 16" inches

The DrainstopperTM successfully combines a durable bladder system which can be installed in-situ with no need for Confined Space training. Our hanging bracket system, which extends up to 3 metres, is installed at the top of the man-hole, and allows the Bladder to simply swing into the inlet/outlet on installation.

This patented technology means that maintenance is no longer a specialist job as the bracket can be lifted and placed back into the hole with ease and simplicity, all from above ground.

The DrainstopperTM system is fully automated, with a control panel which stands next to, or near to the locality of the manhole where the Bladder is situated. The DrainstopperTM system can use Bladders ranging from 4” to 24”, as pressures are properly regulated from the control panel.

Presenting the end user with choice and flexibility, the control panel can be operated by mains electric, or a solar panel, which can be as small as 10W. The solar option allows use of the DrainstopperTM in hard to reach sites, or in locations where it is not cost-effective to run mains power to.

The DrainstopperTM can be activated manually via a push button on the control panel, which inflates the bladder in the man-hole, quickly, and effectively. Once inflated, you can properly deal with the situation in hand, without worry of a pollution incident occurring.

The DrainstopperTM can help bring a site inline with PPG7: Refuelling Facilities and PPG18; Managing fire water and major spills, among others.

Free Brochures and Leaflets

The Flapstopper


Flapstopper brochure for drain protection.

Designed to withstand the industrial environment; housed in a galvanised steel case, your Industrial TelestopperTM will be ready to use in whatever environment it finds itself.

Offering optimal flexibility the housing of the Industrial TelestopperTM can be wall mounted as an in-situ spill tool, but its portability, enables it to be transferred if necessary. Along with being hard-wearing and space-conscious, the unit is coloured emergency red to highlight its position in any setting should it be needed to mitigate an incident.

The Industrial TelestopperTM comes complete with a 3-metre telescopic pole for suitable use in varying drain depths, along with a heavy-duty stirrup pump for inflating the bladder.

As a complete kit, any size bladder can be ordered with the Industrial TelestopperTM up to a maximum of 24”. Bladders supplied with the Industrial TelestopperTM are durable to most substances found in an on-site drainage system. The fixing at the end of the pole allows the Bladder to be removed whilst in the inflated position, meaning numerous bladders can be used regarding a spill should this be necessary.

Using in-drain containment theory, this dual-purpose drain closure device can help any site meet their legislative requirements.

Manufactured from stainless steel, the Flapstopper™ is more robust than the older bladder style systems. The pollution containment valves can be tailored to bespoke drain measurements, from 100 mm up to ‘000’s of mm. The Flapstopper™ can be activated manually via a push button on the control panel, or remotely using worker operated call points, fire alarm detection equipment, or a range of condition detecting probes, for example, oil interceptor alarms allowing the end user to have total control over their system.


Wireless Call Point


The wireless call point has been designed to activate your Flapstopper™ from a remote location. Any number of call points can be used to operate a system from on site. Being the size of a general fire alarm button, this wireless call point can either be mounted in critical locations where incidents may occur, or can be carried with key members of staff around a site.

The freedom of having a portable unit means that your site will be protected wherever a spill may occur. Furthermore, it saves valuable time mitigating the need to find a spill kit and get it to a particular location, especially on larger sites.

The call point requires minimal training, and can be used however best you see fit – this is a product which is built to work with you, whatever your site-specific needs are.


Wireless Acoustic Ear


The Acoustic Listening Ear is designed specifically to address the issues of fire on an industrial or commercial site. On detecting a prolonged fire alarm, the Acoustic Listening Ear will automatically trigger your Flapstopper™, The Acoustic Listening Ear is designed specifically to address the issues of fire on an industrial or commercial site. On detecting a prolonged fire alarm, the Acoustic Listening Ear will automatically trigger your Flapstopper™.


Flood Alarms

Flooding can arise from many sources including groundwater, storm water run-off, river rise, blocked drains and sewers (sewer flooding). It affects millions of people per year, and is a growing problem for both residential and commercial properties alike.

We can generate and distribute advanced warnings to communities and businesses, using technology which can be used as a stand-alone warning system, or which can be used to create a turn-key package, utilizing flow control, closure, and sampling devices.

Flood gates, air-brick seals, and quick fix sand-bagging all take time to fit or close; therefore there is little point in having a flood alarm on your front door step - it needs to be remote to give you time! A few additional tens of minutes warning can make all the difference when it comes to mitigating the effects.

We have developed a surface mounted flood alarm that is specifically intended as a retrofit that can be installed quickly, with no calibration on site and very minor installation works, on either a solid surface, gravel or ballast.


Blocked Sewer Detection

Nobody wants to be dealing with blocked, or overflowing foul drains. This is especially so if they cause an expensive stop in production, are in a public environment, or induce large fines. But truth be told, it happens more than we all like to think.

Our wireless blocked sewer detection system requires no cabling, or mains power at the probe location. This means that you can monitor remotely what is happening in even the furthest corners of your site.

This battery-powered unity provides a 5-year lifespan, along with regular reporting, fault detection, and fail-safe procedures. Reporting back to our Utility Gateway Receiver, we offer volt-free contacts, so you can link this system directly with your existing BMS, EMS or SCADA system.

We can link a large network of monitoring probes, as many of our water Utility clients choose to do, so they can proactively prevent sewage disturbance by sending engineers to site to deal with the issue in hand. In addition to this, we can build smaller unique packages which may include email, or text alerting to individuals, or key members of staff.

We can offer our software package providing stand-alone monitoring on your PC. This allows complete control over your system.

The effects of Combined Sewer Overflows (CSO’s) where the outfall is into a public area or on a private beach can be proactively monitored and mitigated when using our blocked sewer detection system along with the Flapstopper TM technology.


Using valves to close off these outfalls can buy time for engineers to resolve issues before causing an environmental hazard, which would be liable for fines.

Very often spill and fire water costs will not be covered by standard environmental insurance, especially if there is any question that adequate containment and safety procedures were not adhered to. We therefore urge all readers to check their environmental liability insurance for spill and fire water run off cover and consult the Environment Agency for advice on appropriate containment.

Download and View The Drain Blocker Brochure

Vat GB591551821 Company Number 02906480 – 1994
Dun and Bradstreet, Number (581590544)
NATO Code Number (NCAGE KD520)
EORI Number GB591551821000

Email info@merlin-industrial.com

Merlin Industrial Products @ 2024 Errors and Omissions Excepted


Call 01752 690622 / 0800 0418 650 (UK)