7/8 inch Brass Compression Union Compression x Compression

7/8 Inch Brass Compression Union – Lead-Free, Straight Connection for Copper Tubing

The 7/8 inch Brass Compression Union is a mechanical fitting designed for joining two sections of copper tubing in low- to medium-pressure water distribution and utility systems. This union provides a straight inline connection without the need for heat, solder, or specialized press tools, making it suitable for applications requiring disassembly or maintenance access.

Key Features

• ✅ Compression Connection – Connects copper tubing via ferrule and nut assembly; requires only basic tools for installation.
• ✅ Lead-Free Brass Body – Manufactured from dezincification-resistant brass in compliance with ANSI/NSF 61 and 372 standards for potable water use.
• ✅ Reusable Design – Can be disconnected and reassembled without damaging tubing or requiring replacement components.
• ✅ Inline Flow Path – Maintains uniform internal diameter to reduce flow restriction and support consistent system pressure.

Technical Specifications

• Material: Lead-free brass (DZR brass alloy)
• Size: 7/8 inch OD tubing
• Connection Type: Compression x Compression (straight union)
• Application: Copper tubing in water supply, HVAC, or utility piping systems
• Operating Pressure: Typically rated up to 200 PSI
• Temperature Range: 32°F to 200°F (dependent on tubing and seal integrity)
• Certifications: NSF/ANSI 61 & 372, compliant with Safe Drinking Water Act (SDWA)

Installation Guidelines

Ensure tubing is cut square and deburred prior to assembly. Slide the compression nut and ferrule onto the pipe, insert the pipe into the union body until it seats fully, then tighten the nut using a wrench while supporting the body. Do not overtighten, as this may deform the ferrule or damage the pipe.

Applications

This union fitting is used in residential and commercial plumbing systems where copper pipe sections must be joined or accessed without permanent bonding. Common use cases include:

• Water heater or boiler installations
• Utility sinks and fixture supply lines
• Maintenance connections in copper tubing systems

The 7/8 inch Brass Compression Union provides a mechanically reliable, code-compliant solution for joining copper tubing in potable water and utility systems where soldering is not practical or permitted.