Grommet - male thread - N - 28mm-R5/4" IVAR.IVN81

Product detailed description

This stainless steel press-to-thread adapter is commonly used in residential and commercial buildings for connecting press-fitted copper or stainless steel tubing to threaded components. It finds application in heating, plumbing, fire suppression and industrial systems where a secure and leak-free transition between press and threaded connections is required. The fitting is suitable for use in closed-loop systems such as underfloor heating, hot water distribution and solar thermal circuits, where thermal expansion and vibration may occur. Installers must ensure correct alignment and compression during installation to prevent leakage and maintain system integrity.

Technical parameters

Material	Stainless steel grade Wst. Nr. 1.4404 (AISI 316L), EPDM O-ring
Operating temperature	-20 °C
Nominal pressure	PN 16
Code	IVN81.2814
Brand	IVAR

The nominal pressure rating of PN16 means the fitting can safely handle 16 bar of system pressure at ambient conditions. The operating temperature range allows use in chilled water systems down to -20°C and hot water or heating applications up to +85°C, with a short-term maximum of +120°C. These parameters are essential for correctly sizing the component in relation to the system's design pressure and temperature profile.

Installation and connection

To install the IVAR IVN81.2814, first prepare the 28mm press tube by cutting it cleanly and deburring the end. Insert the tube into the press side of the fitting until it reaches the stop mark. Ensure the O-ring is properly seated in its groove. On the threaded side, match the R5/4'' external thread with the corresponding internal thread on the connected component. Tighten the connection using a standard wrench, ensuring the thread engagement is full and undamaged. After installation, verify the seal by checking for any movement or gaps between the tube and the fitting body. Common installation errors include using incorrect tube wall thickness, failing to align the tube properly, or over-tightening the threaded connection, which can damage the O-ring or the fitting body.

Compatibility and accessories

The IVAR IVN81.2814 is compatible with press-fitted stainless steel or copper tubing of 28mm outer diameter. For a secure connection, ensure the press tool is calibrated for the specific tube material and wall thickness. Additional components such as press tools, thread sealant and sealing tapes may be required depending on the system setup. This fitting is part of the IVAR press system and works with other IVAR press fittings and tools.

Technical background for designers

This adapter functions by compressing the tube against a sealing surface using a press tool, creating a metal-to-metal seal reinforced by the EPDM O-ring. The stainless steel construction (1.4404/AISI 316L) ensures resistance to corrosion and thermal cycling, making it suitable for both hot and cold media. The EPDM O-ring provides flexibility and sealing performance across the operating temperature range. When designing systems, account for thermal expansion differences between the tube and surrounding structures to avoid stress on the fitting. The PN16 rating ensures compatibility with medium-pressure heating and plumbing systems, while the temperature range supports applications involving both chilled and heated fluids.

Service and operation

Routine visual inspections should be carried out to detect signs of mechanical stress, leakage or corrosion. If the fitting is exposed to temperatures beyond the specified range or subjected to excessive mechanical load, it may require replacement. No scheduled maintenance is required for the fitting itself, as the press connection is designed to be permanent once correctly installed. Any suspected leaks should be investigated immediately by checking the alignment and compression of the tube within the fitting.

Frequently asked questions

Can the IVAR IVN81.2814 be used in solar thermal systems?
Yes, it is suitable for solar thermal systems due to its operating temperature range up to +120°C and resistance to thermal cycling.

Is this fitting compatible with copper press tube?
Yes, provided the copper tube has a 28mm outer diameter and is compatible with the press tool used for installation.

Can this fitting be used in industrial gas applications?
Yes, it is suitable for inert gases and industrial applications within its temperature and pressure limits.