Transition coupling Unidelta 40mm x 5/4" PE female thread (model 601640)

Unidelta transition coupling 40mm x 5/4" PE female thread (model 601640) is a polyethylene (PE) fitting designed to connect 40 mm PE pipe to a 5/4" (1¼") female threaded fixture. The coupling provides a secure mechanical connection between PE piping systems and threaded components used in water supply, irrigation networks, and other utility lines where a PE-to-thread transition is required. Constructed from durable PE material, the fitting resists corrosion and is intended for outdoor and underground installations compatible with standard PE pipe dimensions.

Advantages

This Unidelta coupling offers a simple and reliable transition from PE pipe to a threaded connection without the need for additional adapters. Its polyethylene construction ensures chemical resistance and low susceptibility to corrosion compared with metal alternatives. The integrated female thread provides a standardized connection point for compatible threaded valves, hydrants, or fittings, enabling straightforward assembly and maintenance of plumbing or irrigation lines.

Suitable for

• Connecting 40 mm PE piping to 5/4" (1¼") threaded valves or fittings
• Irrigation systems and garden water distribution
• Outdoor water supply lines and utility conduits
• Temporary or permanent plumbing transitions between PE and threaded components

Key specifications

• Material: Polyethylene (PE)
• Pipe connection diameter: 40 mm
• Thread type: Female threaded end sized for 5/4" (1¼")
• Application: Water and utility lines, irrigation and outdoor plumbing
• Installation environment: Suitable for above-ground and buried installations where compatible with local codes

How to use

Prepare the PE pipe by cutting a clean, square end and deburring the inner and outer edges. Insert the 40 mm PE pipe into the coupling to the required depth, ensuring a straight alignment. Secure the mechanical connection according to the coupling's assembly method for Unidelta fittings (for example, with appropriate compression or electrofusion technique if applicable) and tighten the female threaded connection to the mating male-threaded component using suitable thread sealant or tape where recommended for the service. Verify the joint for leaks and perform a pressure test in accordance with local installation standards.

Usage recommendations

Use the coupling only with compatible 40 mm PE pipe and a matching 5/4" male threaded counterpart. Ensure that thread sealants and tightening torques are appropriate for plastic-to-metal or plastic-to-plastic connections to avoid over-stressing the fitting. Follow local plumbing codes and Unidelta installation instructions for depth, backfill, and pressure testing when used in buried applications.