Kayflow 40mm Push-Fit 90 Degrees Knuckle Bend - 40mm
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Product Information
Full details
The Kayflow 40mm Push-Fit 90-Degree Knuckle Bend is an essential component for DIYers and professional plumbers tasked with installing or maintaining domestic grey water drainage systems in kitchens, bathrooms, and laundry areas. This fitting offers the key benefit of tool-free, instant assembly thanks to its reliable push-fit mechanism, though it is specifically designed for 40mm systems and will not accommodate larger or smaller piping diameters without adapters. Constructed from durable polypropylene, this connector provides a flexible solution for redirecting waste water flow while ensuring a watertight seal through integrated rubber rings.
All features
| Model Part Number | 40mm |
|---|---|
| Brand | Truly PVC Limited |
Extended Product Information
FAQs
Does this require any glue?
No, this is a push-fit system that relies on integrated rubber ring seals for a watertight connection.
Can I use this for underground drainage?
No, this product is specifically designed for domestic above-ground internal grey water drainage.
What happens if I make a mistake during installation?
The joints are demountable, meaning you can simply pull the connection apart, check the seals, and reassemble as needed.
Is it compatible with all 40mm pipes?
It is designed for standard 40mm metric waste pipe sizes compliant with BS EN 1451.
How long is the warranty?
This product comes with a 10-year manufacturer guarantee.
Can it withstand boiling water?
Yes, polypropylene is designed to handle the temperatures typically produced by domestic dishwashers and washing machines.
Troubleshooting
Joint is leaking
Ensure the pipe is inserted fully past the seal and is not scratched. Check that the pipe was deburred properly during installation.
Difficult to push pipe into the fitting
Apply a small amount of silicone lubricant to the end of the pipe and ensure the pipe end is not distorted or damaged.
Pipe feels loose within the joint
Verify that you are using 40mm outer diameter pipe. If the pipe is undersized or damaged, it will not create a seal.
Pros and Cons
Pros
- No adhesives or specialized tools required for installation
- Easy to disassemble for maintenance or pipe adjustments
- Highly resistant to heat and common household chemicals
- Complies with BS EN 1451 safety and quality standards
- 10-year warranty indicates long-term reliability
Cons
- Compatible only with 40mm pipework systems
- Requires proper pipe deburring to ensure seals remain intact
- Not suitable for high-pressure or underground drainage applications
Setup, Compatibility & Care
To ensure a successful installation, cut your 40mm pipe squarely and ensure the end is free from sharp plastic burrs that could tear the internal rubber seal. Lubricate the end of the pipe slightly if the fit feels overly tight. Insert the pipe firmly into the knuckle bend until you feel it seat against the internal stop.
This system is fully compatible with standard domestic 40mm pipework. For care, avoid using abrasive chemical cleaners on the exterior of the fitting. Periodically check joints for signs of moisture if you suspect a blockage has occurred upstream. Always ensure that the pipes are supported by appropriate clips to prevent sagging, as the weight of water over time can put stress on push-fit connections.