Buffalo 150mm Non Return Valve

£89.89 Excl. VAT

Buffalo Retro-Fit Non-Return Valve for 6 Inch (150mm) Sewerage Pipe | Rodent and Water Stoppage Protection

Key Features:

  • Fits: 136mm – 152.5mm internal diameter of pipe (6 inch /150mm). Perfect for foul drainage pipes.
  • FITS CLAY, PLASTIC (PVC) and CONCRETE pipes to inspection chambers and the end of pipe
  • Prevents rodents, vermin, and snakes entering your property from the drainage system. Stainless steel plate in the single flap will stop rats climbing up the drains and into your property.
  • NO TOOLS REQUIRED. Easy retro push fit into PVC or clay pipes.
  • ANTI FLOODING NON RETURN VALVE – STOP BACKFLOW in flooding, preventing sewage entering your property.

Safeguard Your Property from Flooding and Rodent Infestations with the Buffalo Retro-Fit Non-Return Valve

Experience the of a protected property with the Buffalo Retro-Fit Non-Return Valve, a versatile solution that effectively prevents both flooding and rodent infestations. This easy-to-install valve seamlessly fits 6-inch (150mm) sewerage pipes, ensuring compatibility with your existing drainage system.

Download Product Sheet

110mm / 4 inch Valve AVAILABLE HERE


The 150mm Water And Rodent Back Flow Valve comprises a Type 0 Anti-flooding device as per EN 13564-1:2002 (non-return valve) for use in commercial or domestic lateral drains serving multiple properties.

The Buffalo Non Return Valve fits clay and plastic 6 inch or 150mm pipes, and stops the back flow of water, vermin and noxious fumes entering a property through the pipe or sewage line.

Unparalleled Protection:

  • Blocks Backflow: Say goodbye to the risk of flood damage. The non-return valve mechanism effectively prevents backflow of wastewater and sewage during flooding events, safeguarding your home from costly water damage.
  • Deters Rodents: Keep unwanted pests at bay. The stainless steel flap provides a robust barrier against rodents, preventing them from entering your property through the drainage system.
  • Prevents Noxious Fumes: Eliminate unpleasant odors and foul gases from entering your home. The valve effectively seals off the entry point, preventing noxious fumes from escaping the drainage system.

Effortless Installation and Universal Fit:

  • Simple Push-Fit Installation: No tools or DIY experience required. Simply push the valve into the end of a drain pipe or inlet into an inspection chamber for a secure and hassle-free setup.
  • Universal Fit: Compatible with both clay and plastic pipes, the Buffalo Retro-Fit Non-Return Valve seamlessly integrates with your existing drainage system.

Additional Benefits:

  • Durable Construction: Crafted from high-quality materials, the valve is built to withstand the rigors of everyday use and harsh environmental conditions.
  • Lockable Flap: A lockable flap allows you to close down entry pipes to inspection chambers for essential maintenance without compromising protection.
  • Cost-Effective Solution: Protect your valuable belongings and avoid costly repairs caused by water damage and pest control measures.

The backflow flap valve can be inserted at the end of a pipe to prevent backwater entering from the drainage system.

The flap has an inbuilt stainless steel plate to stop rats from biting through, providing efficient pest control. Also prevents noxious fumes from entering properties. Suitable for the food and catering sector. Insert the Buffalo valve to protect drains and block rats.

Manufactured in molded polypropylene body, TPE fins and ring seal, and a stainless steel (SS430) plate in the flap.

Designed as a retrofit device to fit into the outlet of DN150 plastic or 6” clay pipes discharging into brick or concrete chambers or to fit into preformed plastic manhole bases (in accordance with BS EN 1329-1:2000), located external to the building.

A lockable flap allows you to close down entry pipes to inspection chambers to allow essential maintenance to be carried out.

Product Specifications

  • TPE Elastomeric material complies with the requirements of BS EN 681- 1:1996.
  • Polypropylene complies with the requirements of BS EN 1852-1:2009 Clause 4.
  • Stainless steel complies with the requirements of BS EN 10088-1:2014 and BS EN 10088-2:2014, Steel number 1.4016 (SS430).
  • The force required to dislodge the valve downstream: 20 kg (when inserted in the larger internal dia plastic pipe of 147mm)
  • Valve step/lip when inserted into pipe less than 2.5mm
  • Minimum internal pipe dia: 146mm
  • Maximum internal pipe dia: 152.5mm
  • Body inlet cross-sectional area: 14262mm2
  • Mouth cross section area: 4,682mm2
  • The Back Flow Valve automatically closes when backflow occurs and allows the normal flow when backflow ceases.
  • In normal flow conditions, the Back Flow Valve opens when there is a depth of water in the pipe on the upstream side of 50mm or more.
  • The internal surfaces of the Back Flow Valve are smooth.

When installed in accordance with the manufacturer’s instructions, there should be a clearance of 2mm between the closure flap and the adjacent wall of the channel.


  • Prevents rodent, vermin, and snake infestations
  • Easy retro push fit into PVC or clay pipes
  • No tools required
  • Anti-flooding non-return valve
  • Durable stainless steel construction

Please Note:

  • ‘Universal’ wording refers to the valve being able to fit both clay and plastic.
  • The valve fits all in-line straight inlets to all inspection chamber bases.
  • Forcing the product may cause damage.
  • All of the valve’s rubber fins must be in the pipe. If any of the rubber fins are exposed, then the product is not fully inserted and not installed correctly.
  • The 150mm non return valve is part of the Buffalo Flood Systems brand.
  • Also available as a 110mm non-return valve


Download Specification