Flexible stepped drain adaptor joins measured 108–122 mm pipe to 121–137 mm pipe for compatible uPVC-to-clay drainage repairs.

Connection ranges

• Smaller end: 108 to 122 mm outside diameter
• Larger end: 121 to 137 mm outside diameter
• Product code: PTE346 / MAC4000

The flexible rubber body is secured by adjustable metal bands, allowing it to seal around pipes within the stated ranges. Measure both actual outside diameters before ordering rather than relying only on nominal pipe sizes.

Clean and align the pipe ends, centre each clamp over its sealing area and tighten evenly to the fitting manufacturer's specified torque. Consider flow direction when changing diameter. Confirm whether the proposed drainage system is private or adopted and whether a shear-banded coupling is required for the installation duty.