Description
CarbonPress® Carbon Steel Press Union
CarbonPress® Carbon Steel Press Unions provide a removable connection between two sections of compatible carbon steel press piping. The union design allows the piping connection to be separated for service, maintenance, or equipment replacement without cutting the adjoining pipe.
CarbonPress® is a 1/2" through 2" carbon steel press fitting system suitable for use with black iron, epoxy-coated, and galvanized Schedule 10 through Schedule 40 carbon steel pipe. When pressed, an internal grab ring grips the outside diameter of the pipe while an elastomeric sealing element creates a leak-tight seal.
CarbonPress® fittings can be installed using Milwaukee or RIDGID press tools with the associated jaws or rings designed for carbon steel applications.
Product Highlights
- Carbon steel press union
- Press connections on both ends
- Removable union-style center connection
- Allows piping sections to be separated without cutting the pipe
- Part of the CarbonPress® carbon steel press fitting system
- Designed for 1/2" through 2" piping systems
- Suitable for black iron, epoxy-coated, and galvanized carbon steel pipe
- Compatible with Schedule 10 through Schedule 40 carbon steel pipe
- Grab ring mechanically secures the fitting to the pipe after pressing
- Elastomeric sealing element provides a leak-tight seal
- Leak Before Press (LBP) Technology
- EPDM and HNBR sealing options
- Compatible with Milwaukee or RIDGID press tools and associated carbon steel jaws/rings
- 15-year limited warranty
Technical Specifications
| Product Type | Press Union |
|---|---|
| System | CarbonPress® |
| Connection Type | Press x Press |
| Configuration | Union |
| Function | Removable Straight-Line Piping Connection |
| System Size Range | 1/2" - 2" |
| Compatible Pipe | Black Iron, Epoxy-Coated & Galvanized Carbon Steel Pipe |
| Compatible Pipe Schedules | Schedule 10 - Schedule 40 |
| Sealing Options | EPDM or HNBR |
| EPDM Temperature Range | -40°F to 300°F (-40°C to 148°C) |
| HNBR Temperature Range | -40°F to 200°F (-40°C to 93°C) |
| Press Technology | Leak Before Press (LBP) |
| Compatible Tool Brands | Milwaukee & RIDGID |
| EPDM Certification | IAPMO Z 1117 |
| HNBR Certification | IAPMO/ANSI LC 4 / CSA 6.32 |
| Warranty | 15-Year Limited Warranty |
CarbonPress® Connection Technology
When the press connections are installed, a grab ring deforms and its sharp edges grip the outside diameter of the pipe, securing the fitting axially and helping prevent movement.
At the same time, an elastomeric sealing element impinges on the pipe to create a leak-tight connection.
Press Union Design
The union configuration provides a removable connection between two press-connected pipe sections. Once the press ends are installed, the center union connection can be separated when access is required for maintenance, service, or equipment replacement.
Leak Before Press Technology
CarbonPress® fittings incorporate Leak Before Press (LBP) Technology, helping identify connections that have not been properly pressed during system testing.
EPDM & HNBR Seal Options
- EPDM: -40°F to 300°F (-40°C to 148°C)
- HNBR: -40°F to 200°F (-40°C to 93°C)
Select the sealing element appropriate for the intended system and application.
Pipe Compatibility
CarbonPress® is suitable for use with:
- Black iron carbon steel pipe
- Epoxy-coated carbon steel pipe
- Galvanized carbon steel pipe
- Schedule 10 through Schedule 40 pipe
- Pipe sizes within the 1/2" through 2" CarbonPress® system
Press Tool Compatibility
CarbonPress® fittings can be pressed using Milwaukee or RIDGID tools with the associated jaws or rings intended for carbon steel press applications.
Applications
Press technology has a multi-decade history of successful use in applications including:
- Hydronic heating systems
- Fire sprinkler systems
- Fluid conveyance
- Gas conveyance
- Oil systems
- Low-pressure steam
Seal selection and system requirements should be verified for the specific application.
Certifications & Warranty
- EPDM: IAPMO Z 1117
- HNBR: IAPMO/ANSI LC 4 / CSA 6.32
- Warranty: 15-Year Limited Warranty
Selection & Application Guidance
- Select the union size to match both carbon steel pipe sections.
- Verify the pipe is within the supported Schedule 10 through Schedule 40 range.
- Confirm whether EPDM or HNBR is appropriate for the intended application.
- Verify temperature and media compatibility before installation.
- Use the union where future disassembly or equipment access may be required.
- Use compatible Milwaukee or RIDGID press tools with the appropriate carbon steel jaws or rings.
- Follow the applicable CarbonPress® installation requirements when preparing and pressing each connection.
Product Documents
CarbonPress® Dimensional Catalog
Review CarbonPress® fitting dimensions and additional technical information.
Press Fittings & Valves Catalog
Review additional Merit Brass press fitting, valve, and system information.
Need Help Selecting CarbonPress® Fittings?
Our industrial PVF specialists can help review your pipe size, pipe schedule, seal requirements, application, quantity, and press-tool compatibility before you order.
Frequently Asked Questions
What is a CarbonPress® union used for?
It is used to join two compatible carbon steel pipe sections while providing a connection that can be separated later for service, maintenance, or equipment replacement.
How is a union different from a standard coupling?
A standard coupling creates a fixed straight connection after pressing. A union includes a removable center connection that allows the adjoining piping sections to be separated.
What type of connections does the union have?
The fitting uses CarbonPress® press connections on both ends.
What pipe can CarbonPress® fittings be used with?
CarbonPress® is suitable for black iron, epoxy-coated, and galvanized Schedule 10 through Schedule 40 carbon steel pipe.
What sizes does the CarbonPress® system cover?
The CarbonPress® system covers sizes from 1/2" through 2".
What is the EPDM temperature range?
The EPDM temperature range is -40°F to 300°F (-40°C to 148°C).
What is the HNBR temperature range?
The HNBR temperature range is -40°F to 200°F (-40°C to 93°C).
Do CarbonPress® fittings have Leak Before Press technology?
Yes. CarbonPress® fittings incorporate Leak Before Press (LBP) Technology.
What press tools can be used with CarbonPress®?
CarbonPress® fittings can be pressed with Milwaukee or RIDGID tools and the associated jaws or rings for carbon steel applications.
What warranty is provided?
CarbonPress® fittings have a 15-year limited warranty.
Important Ordering Notes
- CarbonPress® carbon steel press union.
- Press connections on both ends.
- Removable union-style center connection.
- Designed for the 1/2" through 2" CarbonPress® system.
- Suitable for black iron, epoxy-coated, and galvanized pipe.
- Compatible with Schedule 10 through Schedule 40 carbon steel pipe.
- EPDM and HNBR sealing options have different temperature ratings and certifications.
- Leak Before Press (LBP) Technology.
- 15-year limited warranty.
- Confirm nominal pipe size, pipe schedule, seal material, and application requirements before ordering.
