Couplings by pressure rating
Low Pressure up to 19 bar
The Nitto Kohki low-pressure Cupla series cover operating pressures up to 19 bar (1.9 MPa) and are designed for compressed air, nitrogen and other non-aggressive gases as well as water. From the miniature Micro Cupla through the best-selling HI Cupla (1.5 MPa) to the large-bore Super Cupla, the range offers a matching connector for every nominal size and flow requirement - in brass, steel and stainless steel 1.4301/1.4404.
All low-pressure series use the proven one-touch sleeve mechanism for tool-free connection and disconnection in under one second. The automatic socket-side shut-off prevents pressure loss on disconnection, while the ball-latch locking withstands full working pressure. ISO 6150-B versions ensure interchangeability within existing compressed-air networks.
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Buying guide
How to choose Low Pressure up to 19 bar
What matters when choosing: properties, comparison and typical applications.
Technical advantages - low-pressure Cupla at a glance
Low-pressure quick couplings - Nitto Kohki vs. Parker vs. Stäubli vs. Rectus
| Criterion | Nitto Kohki | Parker | Stäubli | Rectus |
|---|---|---|---|---|
| Standard air series | HI Cupla | Rectus-compatible | RBE / RPL | Series 25/26 |
| Max. working pressure (air) | up to 2.0 MPa (Super/HI 200) | approx. 1.5 MPa | approx. 1.5 MPa | approx. 1.5 MPa |
| Nominal bore range | NB 4-20 mm | NB 5-19 mm | NB 5-18 mm | NB 5-19 mm |
| Miniature body size | Yes (Micro/Small Cupla) | Limited | Limited | Mini series |
| One-touch operation | Yes, all series | Yes | Yes | Yes |
| Body materials | Brass/steel/SUS 304/316 | Brass/steel/SUS | Brass/SUS | Brass/steel |
| ISO 6150-B | Yes | Yes | Yes | Yes |
Product overview & typical applications
| Series | Application | Pressure / bore | Key feature |
|---|---|---|---|
| Micro Cupla | small devices, instrumentation, lab air | up to 1.5 MPa, NB 4-6 | smallest body, brass/SUS |
| HI Cupla | general compressed air, tools | up to 1.5 MPa, NB 6-15 | standard series, most widely used |
| HI Cupla 200 | compressed air at elevated pressure | up to 2.0 MPa, NB 6-15 | 2.0 MPa variant of the HI series |
| HI Cupla ACE | low-spill air connection | up to 1.5 MPa | valved both ends |
| Super Cupla | high-flow air, large consumers | up to 2.0 MPa, NB to 20 | maximum bore |
| Lever Lock Cupla | large bores, safety-critical | up to 1.5 MPa | lever lock against accidental release |
Typical applications: compressed-air supply in manufacturing and assembly (EN ISO 4414), pneumatic hand tools and assembly lines, workshop and tyre service, laboratory and test air, nitrogen purging, and water/coolant lines in machinery and plant engineering.