1/4 inch Copper Cap Copper x Copper

1/4 inch Copper Cap – Precision Capping for Closed-Line Applications

The 1/4 inch Copper Cap is a critical fitting for sealing the end of copper tube systems in water, HVAC, and other low-pressure plumbing applications. Its compact design allows for efficient use in tight installations, while its copper construction provides long-term resistance to corrosion and wear. Designed for soldering (sweat connection), this cap ensures a permanent, leak-free closure when properly installed.

Key Performance Attributes

• Material: Wrought copper, commonly alloy C12200, for durability and corrosion resistance.
• Connection Type: Sweat/solder (cup-style fitting designed for copper tube insertion).
• Application: Termination of 1/4 inch nominal copper tubing in water supply, HVAC refrigerant, and low-pressure air systems.
• Pressure Rating: Suitable for use in pressure and non-pressure systems; typically rated up to 200 psi in soldered applications, depending on system design.
• Temperature Range: Can withstand fluid temperatures up to 400°F when properly installed using compatible solder alloy.

Use in the Field

This cap is widely used in residential and light commercial plumbing systems, refrigeration lines, and water heater bypass configurations. It provides a clean method of sealing off stub-outs or lines awaiting future extension, as well as for pressure testing systems prior to fixture installation.

Installation Notes

Installation should be performed using industry-standard copper soldering practices. Clean all contact surfaces thoroughly, apply appropriate flux, and heat the joint evenly before applying lead-free solder. Allow the assembly to cool naturally to maintain joint integrity. Always verify system shut-off and pressure relief prior to installation.

Code and Compliance

• Complies with applicable ASTM standards such as ASTM B75 or B88 depending on tube compatibility.
• Acceptable for use in potable water systems under current lead-free legislation (compliant with NSF/ANSI 61 and 372 when applicable).

Did You Know?

Caps are often used during system pressure tests to ensure a fully sealed system before final commissioning, helping identify any line leakage before fixtures are installed.

Specify the 1/4 inch Copper Cap where a permanent or testable system closure is required, and where copper tube systems must be sealed cleanly and reliably. Designed for use in systems built to last, this cap is a reliable solution trusted in code-compliant installations across the industry.