ALCADRAIN double elbow DN40/32 with built-in check valve model P155Z, adjustable 17–23 mm

ALCADRAIN double elbow DN40/32 model P155Z is a compact plumbing fitting designed for drainage and ventilation systems. It provides a controlled change in pipe direction between a 40 mm connection and a 32 mm connection while integrating a non-return (check) valve. The fitting features an adjustable offset of 17–23 mm to accommodate small misalignments and allow precise alignment during installation.

Advantages

The integrated check valve prevents backflow without the need for a separate valve component, reducing space and installation complexity. The adjustable 17–23 mm offset allows installers to correct for minor misalignments between DN40 and DN32 runs, improving fit and sealing. Its compact double elbow design enables direction change in confined spaces and simplifies routing of drainage or ventilation piping.

Suitable for

• Domestic and commercial drainage systems where a DN40 to DN32 transition is required
• Ventilation ducting and waste pipe runs with limited space for bends
• Installations requiring backflow prevention in horizontal or slightly angled sections
• Retrofit or repair jobs where pipe alignment needs small adjustment (17–23 mm)

Key specifications

• Connections: one end for 40 mm pipe, one end for 32 mm pipe
• Function: double elbow with integrated non-return (check) valve
• Adjustable offset range: 17–23 mm
• Application: drainage and ventilation piping
• Design: compact elbow to facilitate installation in confined spaces

How to use

Measure and prepare the DN40 and DN32 pipe ends, ensuring clean, deburred surfaces for reliable sealing. Adjust the elbow to the required offset within the 17–23 mm range to align both pipe runs. Insert the pipes into the corresponding ends and secure per the pipe system's recommended joining method (push-fit, solvent weld, or mechanical coupling as appropriate). Verify that the check valve orientation corresponds to the intended flow direction to ensure correct backflow prevention. After installation, test the system with water or air as applicable to confirm sealing and valve operation.

Usage recommendations

Use this double elbow in accessible locations for maintenance and inspection of the integrated check valve. Avoid excessive mechanical stress on pipe joints and ensure the valve is oriented with the flow direction to maintain reliable non-return function. For solvent or adhesive-based connections follow the adhesive manufacturer's curing times before pressurizing the system.