Drainage Knuckle Bend - Double Socket - 90 Degree x 160mm

Our underground drainage bends are available with either a single or a double socket. The sockets ...

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Professional Building SuppliesPbsl Group Drainage Knuckle Bend Double Socket - 90 Degree X 160Mm
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HSS HireFloplast Green Double Socket 87.5 Degree Bend 160Mm Underground 6D561
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Product Information

Full details

This guide is for plumbers and DIY enthusiasts working with underground drainage systems. The PBSL Group 160mm Drainage Knuckle Bend offers a reliable solution for redirecting pipe flow at a 90-degree angle, ensuring efficient system design. A key consideration is the need for silicon lubricant during installation for optimal seal performance.

All features

Model Part Number5055149943447
BrandFloPlast

Extended Product Information

FAQs

What is the primary use of a 90-degree drainage bend?

A 90-degree bend is primarily used to make a sharp turn or change direction in an underground drainage system, often to navigate obstacles or connect to a main line.

Do I really need to use silicon lubricant?

Yes, silicon lubricant is highly recommended. It makes the push-fit installation easier and helps to protect and maintain the integrity of the rubber seal, ensuring a long-lasting, watertight connection.

What does 'double socket' mean?

A double socket means the fitting has sockets on both ends, allowing it to connect to two spigot-ended pipes or fittings.

Can this bend be used for surface water or just foul water?

This bend is suitable for both surface water drainage and foul water (soil) drainage systems.

What is the diameter of this drainage bend?

This drainage bend is designed for 160mm diameter pipes.

How do I ensure the seal is effective?

Ensure the spigot is pushed fully into the socket until it stops, and that the rubber seal is correctly seated within its recess. Using lubricant also aids seal compression.

What is the 'spigot' end?

The spigot end is the part of the fitting that inserts into the socket of another fitting. It should be oriented in the direction of water flow.

Troubleshooting

Difficulty pushing spigot into socket

Ensure the ends are clean and properly aligned. Apply more silicon lubricant to the spigot and the inside of the socket.

Leak detected at the joint

Check if the pipe is fully seated in the socket. If the leak persists, the seal may be damaged or dislodged. Disassemble the joint, inspect the seal, re-lubricate, and reassemble.

Blockage in the bend

Use a drain rod or jetter to clear the blockage. The 90-degree angle can sometimes be a point where debris accumulates, especially if flow rates are low or solids are present.

Pros and Cons

Pros

  • Easy to install due to the push-fit design.
  • Reliable seal performance when installed correctly with lubricant.
  • Durable materials suitable for underground applications.
  • Offers a critical 90-degree change in direction for complex layouts.

Cons

  • Requires silicon lubricant for optimal performance and ease of installation.
  • Limited to 160mm pipe diameter.
  • Only suitable for drainage, not pressure systems.
  • A 90-degree bend is a significant change; consider flow rates for very high volumes.

Setup, Compatibility & Care

Setup: Ensure the ends of the pipes and the sockets of the bend are clean and free from debris. Apply a thin layer of silicon lubricant to the spigot end and the inside of the socket. Push the spigot firmly into the socket until it is fully seated. The captive rubber seal within the socket will create a watertight connection. Always ensure the spigot end is installed in the direction of water flow.

Compatibility: This bend is designed for 160mm diameter underground drainage pipes. It is compatible with other fittings in the PBSL Group drainage system. It is suitable for soil and rainwater systems but not for pressurized lines.

Care: As this is an underground fitting, minimal care is required after installation. Periodically check connected access points for blockages. Ensure surrounding soil is compacted to avoid ground movement that could stress the joint.

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