Pipe Union: Black | Brass | Sweat

A pipe union joins two pipes end to end while letting them be disconnected later without cutting the pipe or rotating a whole run. A ring nut draws the two halves together against a seat, so a union is the go-to fitting anywhere a line may need to be opened for service. These unions are stocked in black steel and brass (threaded) and sweat copper (solder-on) across the common sizes for water, gas, steam, and black-iron work.

Key Features:

• Serviceable Joint -- Ring nut lets the joint be broken and remade without cutting pipe.
• Three Materials -- Black steel and brass thread on; sweat copper solders on.
• Threaded or Solder -- Threaded (NPT) unions for steel and brass; solder-cup unions for copper tube.
• Seated Seal -- Machined seat draws tight under the ring nut for a leak-free joint.
• Common Size Range -- Stocked from 3/8 in. through 2 in.

Where to Use:

• Building maintenance -- Adding a serviceable disconnect point at valves, pumps, and equipment during repairs
• Rough plumbing -- Building unions into new runs so sections can be opened later
• Code compliance -- Material-matched unions (black, brass, sweat) for approved connections

Available Sizes (SKU -- Size): Black:

• 1004248 -- 1/2
• 1004250 -- 3/4
• 1004245 -- 1
• 1004247 -- 1-1/4
• 1004246 -- 1-1/2
• 1004249 -- 2

Brass:

• 1009565 -- 3/8
• 1004254 -- 1/2
• 1004256 -- 3/4
• 1004251 -- 1
• 1004253 -- 1-1/4
• 1004252 -- 1-1/2
• 1004255 -- 2

Sweat:

• 1004263 -- 1/2
• 1004264 -- 3/4
• 1003779 -- 1
• 1003781 -- 1-1/4
• 1003780 -- 1-1/2