DWV Level Invert Taper (LIT) – Sizes: 50mm to 300mm
The DWV Level Invert Taper (LIT) is a specialised pipe fitting designed to reduce the diameter of a drainage pipe run while maintaining a consistent invert level. This fitting ensures smooth transitions in flow direction without creating internal steps that may impede water or waste movement.
The LIT features a large end that fits into a larger pipe and a smaller end that allows a smaller pipe to fit into it. Unlike standard socket reducers, the LIT is engineered to maintain hydraulic flow levels, making it ideal for graded drain lines where consistent flow is critical. Proper ventilation is essential when installing this fitting to ensure uninterrupted performance.
Key Features:
- Available Sizes: 50mm to 300mm
- Design: Large end inserts into pipe; smaller end receives pipe
- Material: Durable, corrosion-resistant PVC-U
- Finish: Pale grey to match standard DWV fittings
- Application Specific: Compare with socket reducer for best fit
Why Use a Level Invert Taper?
- Maintains flow level in horizontal drainage systems
- Prevents turbulence or flow disruption during pipe size transition
- Ideal for gravity-fed wastewater lines in residential and commercial projects
- Designed for effective waste and vent applications
Typical Applications:
- Sewer and vent lines
- Greywater and blackwater systems
- Stormwater piping (with compatible adaptors)
- Bathroom and kitchen drainage installations
Installation Notes:
- Join with solvent cement joints (SCJ); 24-hour curing required for full strength
- Ensure ventilation points are properly placed to support smooth flow
- Compare to socket reducers before installation to ensure correct application
Performance & Compliance:
- Temperature Range: 0°C to 50°C
- Standards: Complies with AS/NZS 1260 – PVC-U pipes and fittings for DWV applications
- WaterMark Certified
