Sewage Defence

Passive and automatically deployed, Flood Angel Non-Return Valves protect from sewage & waste water

FLOOD ANGEL® 160/110mm Non Return Valve

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The 160mm/110mm Non-Return Valve is a passive flood protection system and is the only rod-able backflow valve on the market.
The Non-Return Valve 160mm/110mm protects basements and ground floor rooms against flooding caused by return flow of sewage waters. Such risk occurs most often in sanitary drainage systems connected to combined sewerage systems and in rainwater drainage systems. It may be caused by intense rainfall, thaw or flood.

  • A passive flood protection system
  • The only rod-able backflow valve on the market
  • Virtually maintenance free
  • Available to fit 100mm diameter drainage pipe
  • It’s always open position allows unrestricted free flow
  • May be installed in main-drain or branch
  • Economic property protection – usually only one valve needed per household
  • Over 40,000 of these award-winning products have been successfully installed
  • 2 year manufacturer’s guarantee


The 160mm/110mm Non-Return Valve uses the power of the flood water to close itself. Once waters subside, the Backflow Valve opens again.

In normal operation the system is fully open allowing solids to flow freely and unrestricted through the valve, the efficiency of movement is also improved by in-built flow wings in the valve body.

Because of its fully open design the valve offers no restriction to cleaning rods, which facilitates drain maintenance and the clearing of blockages further down the branch. Air is allowed to circulate freely through the valve and drainage system eliminating the risk of gas build-up or smells.

In the event of water surging back through the pipes or in flood conditions, the backflow automatically lifts a gate within the valve which shuts against a neoprene gasket seal and prevents backflow past the valve.

May be installed in main drain or at branch.


Body, Lid, Gate – Acrylonitrile Butadiene Styrene (ABS) Lid Bolts – Stainless Steel Gate Seal – Neoprene 241 ‘O’ ring Lid Gasket – closed-cell Neoprene Gate Floats – closed-cell cross-linked Polyethylene.

The valve design has won numerous awards and has been described as the most innovative and effective solution to sewage backflow available. It is fully certified by CSA International, a global provider of product testing & certification services for US, Canada and countries worldwide and has been vigorously tested in the most adverse of backflow conditions. Fulfils requirements of European Standards EN 13564-1:2002.

Height – mm Width – 254mm Length – 534mm 100mm European Standard Weight – 2.4kg Connections – EU Standard Male Chamfered


FLOOD ANGEL® Toilet Bung

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U bend toilet bung is a simple, inflatable device used to prevent sewage backflow coming back up the toilet under flood conditions. The bung is designed to fit into the U bend of a toilet to prevent sewage backflow.

The bung is a strong rubber bag, attached to a hose with a Schrader valve on the end and it is supplied with a hand pump.

• Cost effective backflow protection
• Easy and quick to deploy
• 2 year manufacturer’s guarantee


Max inflation pressure: 1.5Bar (20psi)
Max back pressure: 0.75Bar (10psi)
Approximate total weight: 0.3kg

PVC bag

FLOOD ANGEL® 50mm Back Water Valve

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An anti-flooding device protecting interiors from flooding caused by backflow of sewage. Such risk exists most frequently in sanitary drain systems connected to combined and other sewage systems.

The 50mm backwater valve is an ideal anti-flooding device for protecting interiors from flooding caused by backflow of wastewater in all drainage-related systems such as washing basins, kitchen sinks, shower bases and dishwashing machines.

  • The Backwater Valve is a passive flood protection solution
  • Operates fully automatically, no external power supply needed
  • Substitutes an inspection chamber, mounted at sewage system outlet from building
  • Resistant to effects chemicals and to hot wastewaters
  • Permits temporary blocking of wastewater flow (for overhaul works)
  • Maintains full flow capacity of the sewage system
  • Easy to operate and to maintain
  • 2 year manufacturer’s guarantee


The Backwater Valve uses the power of the flood water to close itself. Once waters subside, the Backwater Valve opens again.

Resistant to effects chemicals and to hot wastewater.

An ideal solution where it is impossible to assemble a backwater valve protecting the whole building, e.g. In an apartment block, public utility buildings, industrial premises, hospitals, hotels, offices – both in new systems and modernized ones.


Connection diameter – 50mm Weight – 0.15 Max operating temperature – 95° Max operating pressure – 0.5 bar

The product is made of high-quality polypropylene (PP), a very durable material that is mechanically resistant as well as resistant to aggressive effects chemicals and to hot wastewaters. Cover mounting bolts of chromium-nickel stainless steel of OH18N9 type. Cover and flap gaskets made of EPDM rubber with improved resistance to weather factors and ageing. Flow cut-off flap with chrome-nickel guard.

CE Product fulfils the requirements of European Standards EN 13564-1:2002 SIZE Height – 121mm Width – 78mm