A stainless steel press fit coupling is used to connect two straight pipe sections in a double-press piping system. It provides a clean pipe-to-pipe connection without welding or threading, making it suitable for stainless steel water supply, HVAC and industrial piping installations.
Nonleak double press-fit couplings are part of our Double Press Fittings system. They are designed to work with matching stainless steel pipes and related stainless steel pipe fittings for reliable pipeline extension and size transition.
Press Fit Coupling for Straight Pipe Connections
The press fit coupling is one of the most commonly used fittings in stainless steel press-fit piping systems. It connects pipe sections in a straight line and helps installers extend, repair or modify pipeline runs efficiently.
This integrated product page covers two main coupling types:
- Equal Coupling: Used to connect two pipes with the same nominal diameter.
- Reducing Coupling: Used to connect two pipes with different nominal diameters.
Equal and Reducing Coupling Options
Equal couplings are suitable for standard straight pipe extension where both sides of the connection use the same pipe size. They are commonly used in long pipe runs, branch extensions and installation sections that require a smooth and continuous internal flow path.
Reducing couplings are used when the pipe size needs to transition from a larger diameter to a smaller diameter within the same stainless steel piping system. This helps simplify layout design and reduce the need for extra fittings in suitable applications.
How This Coupling Differs from Threaded Pipe Couplings
Unlike a threaded stainless steel pipe coupling or NPT coupling, this press fit coupling is designed for double-press pipe-to-pipe connections without threaded ends. It is used when the pipeline needs a press-fit straight connector rather than a male or female threaded interface.
For male or female threaded connection requirements, Nonleak can provide separate threaded coupling options under the corresponding threaded press-fit product series.
Engineered for Double-Press Installation
Nonleak stainless steel double press-fit couplings use a press connection structure designed for stable installation performance. When installed with matching pipes, sealing elements and tools, the fitting helps create a secure straight connection in the pipe system.
- Double-Press Structure: Supports reliable connection performance in compatible stainless steel pipe systems.
- Straight Pipe Alignment: Helps maintain a smooth pipe run and clean installation layout.
- Equal and Reducing Design: Supports both same-size pipe connection and pipe size transition.
- Stainless Steel Construction: Suitable for clean water, HVAC and industrial utility piping projects.
Cross-section Diagram
Quality and Compliance for Long-Term Performance
Nonleak press fit coupling fittings are manufactured for dimensional consistency, clean sealing surfaces and stable installation quality. Material options can include 304 / 316L stainless steel according to project requirements and operating conditions.
For stainless steel tubing material reference, buyers may review ASTM A269/A269M. For project-specific size selection, installation details and system matching, you can also check Nonleak Technical Documentation.
- Material Options: 304 / 316L stainless steel can be selected according to project conditions.
- Dimensional Matching: Coupling size should match pipe diameter, press profile and installation requirements.
- Inspection Support: Each fitting is designed for stable press-fit installation and reliable straight connection performance.
Press Fit Coupling Specification Table
| Model | Nominal Diameter | Dimensions(mm) | NPS |
| SKZ15 | DN15 | 16 | 1/2″ |
| SKZ20 | DN20 | 20 | 3/4″ |
| SKZ25 | DN25 | 25.4 | 1″ |
| SKZ32 | DN32 | 32 | 1-1/4″ |
| SKZ40 | DN40 | 40 | 1-1/2″ |
| SKZ50 | DN50 | 50.8 | 2″ |
| SKZ60 | DN60 | 63.5 | 2-1/2″ |
| SKZ65 | DN65 | 76.1 | 2-1/2″ |
| SKZ80 | DN80 | 88.9 | 3″ |
| SKZ100 | DN100 | 101.6 | 4″ |
| SKZ125 | DN125 | 133.3 | 5″ |
| SKZ150 | DN150 | 159 | 6″ |
| SKZ200 | DN200 | 219 | 8″ |
For full model sizes, dimensions and project selection details, please download the press fit coulping product parameter sheet or contact Nonleak for technical support.
Typical Applications
Stainless steel press fit couplings are suitable for straight pipe connections in building and industrial piping systems.
- Extending straight pipe runs in water supply systems.
- Connecting pipe sections during new installation or system modification.
- Reducing pipe size within a stainless steel press-fit pipeline.
- Repairing or replacing straight connection sections in suitable piping layouts.
- Supporting clean, welding-free installation in compatible double-press systems.
Need a Press Fit Coupling for Your Project?
Contact Nonleak to select the right stainless steel press fit coupling for your pipe size, reducing combination, material requirement and project application.
