Comap straight press-fit coupling, crimped end, internal thread 40x3.5–1¼

The Comap straight press-fit coupling with a crimped press end and an internal thread 40x3.5–1¼ is a connector designed to join a press-fit pipe on one side with a threaded fitting on the other. It combines a permanent press connection for reliable leak-free performance with a female threaded outlet to accept standard 1¼" threaded components. The coupling is suitable for plumbing and heating systems where a transition from a press-joined pipeline to a threaded accessory or valve is required.

Advantages

This coupling offers a secure press connection that reduces installation time compared with traditional soldering or flaring methods while providing a threaded interface for compatibility with existing components. The crimped press end ensures consistent mechanical strength and a tight seal when installed with the correct tooling. Its straight design allows for inline transitions without changing pipe alignment.

Suitable for

• Connecting 40x3.5 press-fit pipes to 1¼" female threaded valves or fittings
• Plumbing repairs and service connections requiring a threaded outlet
• Heating system installations where a press-to-thread transition is needed
• Extensions or modifications of existing press-fit piping networks

Key specifications

• Connection types: press-fit (crimped) end and internal (female) thread
• Press-fit pipe compatibility: nominal 40 x 3.5 mm
• Thread size: 1¼ inch internal thread
• Design: straight coupling for inline connections
• Typical applications: potable water, heating circuits and general plumbing where compatible materials are used

How to use

Prepare the pipe by cutting square and deburring the end, then insert the pipe fully into the press-fit end of the coupling according to the manufacturer's insertion depth marking. Use the appropriate pressing tool and jaw size for a 40x3.5 press connection and perform the press operation at the indicated location to form a permanent crimped joint. On the threaded side, apply the correct type of thread sealant or tape to the male thread of the mating component as required for the application, then hand-tighten and finish with an appropriate wrench to the recommended torque for the mating fitting.

Usage recommendations

Verify compatibility of pipe material and system pressure/temperature limits before installation. Install using certified pressing tools and calibrated jaws for 40x3.5 connections, and follow local plumbing codes and the manufacturer's instructions for thread sealing and torque values to ensure a reliable, long-lasting joint.