HDPE Flap Valve

Estimate lead times

Typically up to 3 working days

450mm HDPE Flap Valve c/w Fix Kit & Seal

£425.00 + VAT

Althon HDPE Flap Valves can be used in Surface, Sewer and Water Processing Applications.

Althon 450mm HDPE Flap Valves can be used in surface storm and combined sewer applications. The 100mm flap valves are suitable for use on pipework up to 100mm internal diameter.

Our 450mm HDPE flap valve comes complete with a fixing kit and seal to be installed against a flat concrete surface.

Our flap valves are designed to open up to allow water to pass in the desired direction of flow and close when water backs up during storm events to prevent water going back up the pipe

If you don’t have a flat concrete surface to fix to you might be interested in our range of inline valves Check Flex valve

450mm Althon HDPE Flap Valves Feature a co-extrusion seal, making the installation faster and easier without the need for additional tapes or sealants. Constructed from HDPE material, the valves offer a combination of reliable strength and light weight convenience for easier handling and installation. The HDPE design also provides effective protection against environmental factors. With regular inspections and appropriate maintenance, they offer a life expectancy of up to 50 years. Our 450mm HDPE flap valves are suitable for use with pipework up to 450mm.

Max pressure 7mwc

Our offices will be closed from Lunchtime on 23rd December until 8am on 5th January 2026

Orders can still be placed online but we will not be able to process them until our return to the office on 5th January 2026

We hope you have a lovely Christmas and New Year – Althon Ltd