Screwed t-piece 20x1/2x20 with internal thread

Product detailed description

In residential and commercial construction, plumbers and heating engineers often need reliable fittings for connecting plastic-coated copper pipe in underfloor heating, radiator circuits, or water distribution systems. This screw-on tee connector provides a cost-effective alternative to crimped fittings, eliminating the need for specialized tools while ensuring a durable connection. It is commonly used in central heating systems and domestic water supply lines where flexibility and ease of installation are required.

Its compact design allows for straightforward integration into tight spaces such as wall cavities or floor slabs. The internal thread ensures precise alignment when connecting to threaded branch components, making it suitable for both new builds and retrofit projects. The inclusion of two sealing rings ensures a watertight seal under normal operating conditions. Installers should verify that all components are compatible with the system media and follow standard tightening procedures to avoid leaks.

Technical parameters

Material of nut and body	Tinned brass
Material of washer	Teflon
Material of clamping ring	Brass
Maximum long-term temperature	95°C
Maximum long-term pressure	10 bar
Recommended pipe	PEX-AL-PEX 20 x 2
Recommended manifolds	Stainless steel manifolds
Number of sealing rubber rings	2
Application	Underfloor heating, potable water distribution, radiator circuits
For pipe size	20x2 mm
Dimensions and thread of the screw-on fitting	Screwed tee 20x1/2x20 with internal thread
Packing method	Loose
Tightening method	With a spanner
Sealing	EPDM
Types of compatible pipes	PEX-AL-PEX, PE-RT-AL-PE-RT, PERT Frankische, Giacomini, Barbi, HPW, Viessmann and others
Suitable for gas	No
Country of origin	EU
EAN	5900308748060
Weight	0.1 kg
Code	PEX.T.GW20X1/2

The maximum operating pressure and temperature ratings define the conditions under which the fitting can perform reliably over time. These parameters are essential for selecting the correct component for the application and ensuring long-term performance. The presence of two sealing rings indicates that the fitting is designed for double-sealing functionality, reducing the risk of leakage at the connection points.

Installation and connection

To install this screw-on tee, align the internal thread with the corresponding male thread on the branch pipe. Use a wrench to tighten the connection evenly, following standard tightening practices to prevent cross-threading or overtightening. The recommended method involves applying even force until the joint is fully seated and sealed. Avoid using excessive force, as this could damage the sealing rings or the fitting itself. During installation, ensure that the pipe ends are clean and free from debris to maintain a proper seal. Check that the threads are undamaged and properly aligned before securing the connection. A common mistake is failing to apply sufficient lubrication to the threads, which can lead to galling or difficulty in disassembly later. Always verify the alignment after tightening to ensure the fitting sits flush against the pipe surface.

Compatibility and accessories

This tee is specifically designed for use with plastic-coated copper pipe systems such as PEX-AL-PEX, PE-RT-AL-PE-RT, and similar materials. It is compatible with stainless steel manifolds, which are frequently used in underfloor heating applications. For additional options, consider the Screwed tee 20x16x20 for plastic-coated copper pipe, which offers a slightly different configuration for specific installation requirements. When ordering, ensure that the necessary sealing rings and washers are included. These components are critical for maintaining the integrity of the connection and preventing leaks. In larger-scale projects, it is advisable to order spare parts separately to cover potential replacements during installation.

Technical background for designers

The fitting operates through a mechanical compression mechanism between the sealing rings and the inner surface of the pipe. The brass body provides good resistance to corrosion and wear, making it suitable for both hot and cold water applications. The use of EPDM seals ensures flexibility and durability under varying temperatures and pressures. This type of connection integrates well into modular heating and plumbing systems, particularly those requiring frequent adjustments or access. The choice of materials directly impacts the system’s service life and efficiency. Brass components offer excellent thermal conductivity and mechanical strength, while the EPDM seals provide reliable sealing properties over time. Proper system design should account for expansion and contraction of the piping, especially in radiant floor heating systems, to avoid stress on the joints.

Service and operation

Periodic inspection of the connection is recommended to detect signs of wear or leakage. Look for visible cracks, deformation of the sealing rings, or discoloration of the metal surface, which may indicate degradation due to chemical exposure or thermal cycling. If any issues are detected, the fitting should be replaced immediately to prevent system failure. Ensure that the system is drained and depressurized before attempting any repairs or inspections. This reduces the risk of injury and prevents further damage to adjacent components. In high-use environments, consider replacing the sealing rings periodically to maintain optimal performance.

Frequently asked questions

Can this tee be used with PE-RT-AL-PE-RT pipe?
Yes, it is compatible with PE-RT-AL-PE-RT pipe as stated in the technical specifications.

Is a special tool required for tightening?
No, a standard wrench is sufficient for tightening the internal thread securely.

Can it be used for gas applications?
No, it is not suitable for gas due to the sealing material and design limitations.

How many sealing rings come with the fitting?
The fitting includes two sealing rings for enhanced leak protection at the connection points.

Documents for download

• Hygienically certified – Brass fittings for PEX-AL-PEX system (PDF)