Fittings - for PEX pipe, 20 x 2 PEX - EK

Product detailed description

This PEX-to-Eurocone fitting is commonly used in residential and commercial heating and plumbing systems where flexible PEX piping connects to rigid components using conical metric threads. Installers working on underfloor heating circuits, domestic hot water lines, or central heating systems will find this fitting essential for ensuring leak-free connections between PEX and threaded components such as valves, radiators, or manifolds. The fitting is designed for use in systems operating within standard thermal ranges and requires careful handling during installation to maintain sealing integrity.

Proper alignment and tightening are critical to avoid leaks and ensure long-term performance. The fitting is typically used in conjunction with EPDM O-rings and requires specific torque values to achieve optimal sealing. It is suitable for both new installations and maintenance work where PEX piping is integrated into existing systems with Eurocone-threaded fittings.

Technical parameters

Installation and connection

Installation should follow a step-by-step procedure to ensure proper sealing and prevent damage to the O-ring. First, insert the PEX pipe into the fitting, ensuring it reaches the stop point. Next, place the EPDM O-ring into its groove, checking for any cuts or deformations. Thread the nut onto the pipe manually until it seats, then apply a wrench to tighten to the specified torque range of 30–40 Nm. Avoid over-tightening, which can cause deformation of the O-ring or damage to the fitting body.

• Ensure the PEX pipe is clean and free from debris before insertion.
• Check that the O-ring is seated correctly and undamaged.
• Use only a torque wrench to apply the recommended tightening force.
• Do not apply oil or grease to the EPDM components — use silicone-based lubricant if necessary.
• Avoid cross-threading by aligning the nut and pipe carefully before tightening.

Compatibility and accessories

This fitting is compatible with PEX pipes of the specified dimensions and Eurocone-threaded components. For complete system integration, additional components such as PEX crimp rings or expansion joints may be required depending on the system design. No alternative or related products are listed for this item.

Technical background for designers

The fitting operates via a compression mechanism that relies on the elasticity of the EPDM O-ring to create a tight seal between the PEX pipe and the fitting body. The brass CW617N material offers good mechanical strength and resistance to thermal cycling, making it suitable for both short-term and long-term exposure to hot water. The Eurocone thread ensures a secure mechanical connection while maintaining hydraulic integrity. Longevity and performance depend on correct installation, appropriate system pressure, and avoidance of mechanical stress on the joint.

Service and operation

During service checks, inspect the fitting for signs of leakage, corrosion, or mechanical wear. Any visible damage to the O-ring or brass body should prompt replacement. No specific service intervals are provided in the technical documentation. Regular visual inspections are recommended as part of routine system maintenance.

Frequently asked questions

Can this fitting be used with PERT or XLPE pipes?
Only with PEX pipes as specified in the product description. Compatibility with other pipe types is not confirmed.

Is a special tool required for tightening?
A torque wrench is recommended to apply the specified tightening range of 30–40 Nm and avoid over-tightening.

Can the EPDM O-ring be replaced separately?
Replacement O-rings are not specified as available separately in the product documentation. Replace the entire fitting if the seal is compromised.

What lubricant is allowed for the EPDM components?
Only silicone-based lubricants are permitted. Mineral oils may degrade the EPDM material and compromise the seal.