3/8 inch Copper Cap Copper x Copper

3/8" Copper Cap – Sweat Fitting for Pressure and DWV Applications

The 3/8" Copper Cap is a closed-end sweat fitting designed to terminate unused copper tubing in water supply and drainage systems. Constructed from wrought copper, this cap provides a secure method for sealing the end of a Type L or M copper pipe, ensuring system containment under pressure or gravity flow conditions.

Manufactured to ASME B16.22 specifications, this cap meets lead-free requirements outlined in the Safe Drinking Water Act, making it suitable for potable water lines in all jurisdictions. It is engineered for use with soldered connections, forming a permanent, watertight seal when properly installed using lead-free solder and flux.

Key Features

• ✅ Standard Compliance – Fabricated in accordance with ASME B16.22 and NSF/ANSI 61/372 for potable water systems.
• ✅ Wrought Copper Construction – Offers superior mechanical strength and uniformity in high-temperature environments.
• ✅ Sweat Connection – Accepts 3/8" nominal copper tubing (outer diameter 1/2"). Designed for soldered joints only.
• ✅ Pressure and DWV Approved – Rated for use in hot and cold water systems, as well as vent and drain applications.
• ✅ Corrosion Resistant – Copper’s natural oxidation resistance ensures long service life in water distribution systems.

Technical Specifications

• Size: 3/8" nominal (accepts 0.500" OD copper tube)
• Material: Wrought Copper (C12200)
• Connection Type: Cup (sweat) x closed end
• Standards: ASME B16.22, NSF/ANSI 61 & 372 (lead-free)
• Application: Water supply, DWV, hydronic heating

Installation Guidelines

Use a deburred copper tube cut to length and clean both inside the cap and outside the tubing with a proper abrasive. Apply flux to both surfaces before inserting the tubing fully into the fitting cup. Use a torch to heat the joint evenly, applying lead-free solder until the capillary action draws it into the seam. Allow the joint to cool naturally without disturbance for a solid seal. Follow local code for testing and inspection.

Common Use Cases

This cap is ideal for terminating pipe branches during phased installations, pressure-testing future additions, or permanently sealing discontinued lines in copper supply or DWV configurations. It is frequently used during remodels, fixture reconfigurations, and system isolations.

Code Compliance Note

Lead-free copper caps are required for all potable water installations in accordance with the Reduction of Lead in Drinking Water Act (2014). Always verify installation against applicable local and state plumbing codes.