Value Brand Copper Sweat Union 2 1/2 in Cup 336 psi 400°F

Copper sweat union for 2 1/2 in tubing

This copper sweat union joins two lengths of 2 1/2 in copper tube in a straight line. It is made from cast copper and rated for 336 psi at 100 degrees F and 400 degrees F maximum temperature. Plumbers and HVAC installers use it for permanent, leak-tight connections in water, heating or refrigerant lines.

Replaces threaded or flanged joints on the same

The cup-to-cup design eliminates the need for pipe threads or flange sets when the system already uses 2 1/2 in copper tube. The step up is worthwhile when a joint must be demountable for service but the installer prefers soldered ends over mechanical couplings. It is not suited for systems that require a flanged connection or a different tube diameter.

Holds rated pressure continuously at elevated

The casting maintains its 336 psi rating at the full 400 degrees F operating limit, so the joint does not degrade during sustained high-temperature service. Thermal cycling in heating or steam lines does not loosen the soldered cups because the union nut absorbs the movement. The fitting is not designed for pressure spikes above the stated maximum or for vibration-prone installations without proper support.