Compact Zero Spill Cupla

Quick couplings

The Nitto Kohki Compact Zero Spill Cupla is a compact stainless steel (SUS) quick coupling with EPDM seals and leak-free disconnection technology. The range covers four items in nominal sizes 1 and 2 as plug (PM) and socket (SM): CZL-1PM, CZL-2PM, CZL-1SM and CZL-2SM. The Zero Spill function prevents any fluid escape during disconnection or connection - no drips, no spray. EPDM seals are particularly suited to water, hot water, steam and polar media.

⚙ Stainless steel (SUS), EPDM seal - corrosion-resistant, for water, hot water and polar media

✓ Zero Spill technology - no fluid escape on disconnection or connection

⚡ Compact design - space-saving dimensions for confined installation situations

↕ Nominal sizes 1 and 2 - CZL-1PM/SM (size 1) and CZL-2PM/SM (size 2)

✦ PM/SM connections - plug (PM) and socket (SM) per nominal size

Part number	Nominal size	Type	Body material	Seal
CZL-1PM	1	Plug (PM)	Stainless steel (SUS)	EPDM
CZL-1SM	1	Socket (SM)	Stainless steel (SUS)	EPDM
CZL-2PM	2	Plug (PM)	Stainless steel (SUS)	EPDM
CZL-2SM	2	Socket (SM)	Stainless steel (SUS)	EPDM

Typical applications: Cooling water and temperature-control circuits in laboratory and medical equipment, hot-water and steam lines (EPDM), cleanroom applications mandating stainless steel, any liquid-carrying system where drip losses during coupling changes are unacceptable (optical laboratory apparatus, analytical instruments, chromatography), and compact installations with confined space constraints.

Technical data from the manufacturer catalogue

Series	COMPACT ZEROSPILL CUPLA
Body material	Stainless Steel (SUS304), Nickel plated on Socket body
Seal material	Ethylene-propylene rubber (EPDM)
Max working pressure	1.0 MPa {10 kgf/cm2, 10 bar, 145 PSI}
Working temperature	Ethylene-propylene rubber (EPDM): -10 °C to +100 °C
Valve structure	Two-way shut-off (Spill Reduction)
Applicable fluids	Air, Water
Vacuum service	Please contact us if vacuum is required for your application.
Size range	Thread 1/8 inch, 1/4 inch
Catalogue page	C01en-b, 29

Operating principle

Both halves close on disconnection, so the line contents are retained on both sides.

Connecting sequence of a ball locking quick connect coupling.

Compact size saves space. Outer diameters of 16 mm (CZL-1SM) and 18.5 mm (CZL-2SM).
High flow rate for efficient cooling.
Easy operation, push-to-connect function.
Valve structure reduces air inclusion on connection and liquid spillage when disconnecting.
Small, high flow type for coolant piping.

All models of the series

PM - Male thread

Model	Coupling part	Application	Stainless steel (g)	L	C	T	øH (WAF)	øoD
CZL-1PM	Plug	Rc 1/8	11	34	20	R 1/8	Hex.11	12
CZL-2PM	Plug	Rc 1/4	19	39.5	21.5	R 1/4	Hex.14	15.5

SM - Male thread

Model	Coupling part	Application	Stainless steel (g)	L	T	øH (WAF)	øoD
CZL-1SM	Socket	Rc 1/8	38	(53)	R 1/8	Hex.13	16
CZL-2SM	Socket	Rc 1/4	49	(55.5)	R 1/4	Hex.16	18.5

Dimensions in millimetres. Values in brackets apply in the connected condition.

Legend: L = overall length; H = width across flats or outside dimension; D = socket outside diameter; A = hose barb length; C = sleeve dimension; T = thread or barb size; B = bore

Series comparison

Series	Max working pressure	Size range	Valve structure	Applicable fluids
COMPACT ZEROSPILL CUPLA	10 bar	Thread 1/8 inch, 1/4 inch	Two-way shut-off (Spill Reduction)	Air, Water
CUPLA HOSE with FULL BLOW CUPLA	10 bar	Hose size ø5 mm×ø8 mm, ø6.5 mm×ø10 mm, ø8.5 mm×ø12.5 mm	One-way shut-off	Air
FLOW MONITOR	10 bar	Rc 3/8 and Rc 1/2	-	Water
ANTI-VIBRATION PLUG HOSE	15 bar	R 1/4 (SHA-3-2R), R 3/8 (SHA-3-3R)	One-way shut-off	Air
HI CUPLA BL	15 bar	1/4 inch, 3/8 inch, 1/2 inch (thread and hose barb); SN type for urethane hose: for 6.5 x 10 mm, 8 x 12 mm and 8.5 x 12.5 mm hose	One-way shut-off	Air, Water
HI CUPLA Two Way Type	15 bar	Thread 1/4 inch, 3/8 inch, 1/2 inch. Hose barb for dia. 6.5 mm x dia. 10 mm and dia. 8.5 mm x dia. 12.5 mm hose.	One-way shut-off	Air
FLATFACE CUPLA F35	350 bar	Thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch	Two-way shut-off (Spill Reduction)	Hydraulic oil
FLATFACE CUPLA FF	350 bar	3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread)	Two-way shut-off (Spill Reduction)	Hydraulic oil

Choose COMPACT ZEROSPILL CUPLA when air inclusion on connection and liquid spillage on disconnection have to be limited: it is two-way shut-off with spill reduction, while the sibling series in this group - HI CUPLA BL, NUT CUPLA, LOCK CUPLA 200, PURGE LINE CUPLA and ROTARY LINE CUPLA - are one-way shut-off. Its socket outer diameter of 16 mm (CZL-1SM) or 18.5 mm (CZL-2SM) in sizes 1/8 inch and 1/4 inch suits coolant piping in tight space. If the line runs up to 1.5 MPa {15 kgf/cm2}, one of the one-way shut-off peers is the better choice, because this series is rated 1.0 MPa {10 kgf/cm2}.

Body and seal materials

Body material
Stainless Steel (SUS304), Nickel plated on Socket body

Seal material	Mark	Working temperature	Remarks
Ethylene-propylene rubber	EPDM	-10 °C to +100 °C	Standard material

Further catalogue data

Note	Value
Pressure unit table	Working pressure 1.0 MPa, 10 kgf/cm2, 10 bar, 145 PSI
Maximum tightening torque in Nm {kgf.cm}	1/8 inch: 9 {92}, 1/4 inch: 14 {143}
Flow direction	Fluid flow can be bi-directional when socket and plug are connected.
Minimum cross-sectional area in mm2	CZL-1SM×CZL-1PM: 14.9, CZL-2SM×CZL-2PM: 30.2
Admixture of air on connection in mL (may vary depending upon the usage conditions)	CZL-1SM×CZL-1PM: 0.02, CZL-2SM×CZL-2PM: 0.04
Volume of spillage per disconnection in mL (may vary depending upon the usage conditions)	CZL-1SM×CZL-1PM: 0.015, CZL-2SM×CZL-2PM: 0.023
Socket outer diameter	CZL-1SM: 16 mm, CZL-2SM: 18.5 mm
WAF	WAF stands for width across flats.
Flow rate	Cv value: CZL-1SM×CZL-1PM 0.81, CZL-2SM×CZL-2PM 1.61. For comparison the catalogue prints SP CUPLA Type A (our product) 1S-A×1P-A 0.68 and 2S-A×2P-A 1.33. Flow rate - pressure loss characteristics are printed as graphs on pages 30 and 31 (test conditions: fluid water), graph range 1 to 100 L/min.

Interchangeability and size groups

Socket and plug of different sizes cannot be connected.

Safety and application notes

Before use, please be sure to read "Safety Guide" described at the end of this book and "Instruction Sheet" that comes with the products.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 29. The complete catalogue is available for download on this page.

What are Compact Zero Spill Cupla quick-disconnect couplings and their primary industrial applications?

Compact Zero Spill Cupla quick-disconnect couplings are precision-engineered pneumatic and hydraulic connectors designed to eliminate fluid spillage during connection and disconnection operations. These stainless steel couplings with EPDM sealing are extensively used in cleanroom environments, pharmaceutical manufacturing, food processing equipment, and semiconductor production lines where contamination control is critical. The zero-spill design prevents media loss and environmental contamination, making them essential for applications handling compressed air, inert gases, and clean hydraulic fluids in automotive assembly, medical device manufacturing, and precision instrumentation systems.

What are the key technical selection criteria for Nitto Kohki Compact Zero Spill Cupla couplings?

Technical selection of Nitto Kohki Compact Zero Spill Cupla couplings depends on port configuration, material compatibility, and sealing performance requirements. The CZL series offers both socket (SM) and plug (PM) configurations in sizes 1 and 2, with stainless steel construction providing corrosion resistance up to 150°C operating temperature. EPDM sealing elements ensure compatibility with compressed air, nitrogen, and water-based media while maintaining zero leakage performance. Connection thread specifications, flow coefficient values, and pressure drop characteristics must align with system requirements to optimize pneumatic circuit efficiency and prevent performance degradation in high-cycle applications.

Which international standards and certifications apply to Compact Zero Spill Cupla pneumatic couplings?

Compact Zero Spill Cupla pneumatic couplings comply with ISO 4414 pneumatic system safety standards and ISO 14743 pneumatic fluid power coupling specifications for industrial applications. The stainless steel construction meets ASTM A240 material standards while EPDM sealing components conform to FDA 21 CFR 177.2600 regulations for food contact applications. These couplings are designed to meet IP65 ingress protection requirements and comply with REACH regulation for chemical safety in European industrial environments. The zero-spill functionality aligns with ISO 14001 environmental management standards by preventing fluid contamination and workplace safety hazards during system maintenance operations.

What are the differences between CZL-1SM, CZL-2SM, CZL-1PM, and CZL-2PM Compact Zero Spill Cupla variants?

The Compact Zero Spill Cupla variants differ primarily in size designation and coupling configuration within the CZL series architecture. CZL-1SM and CZL-2SM models represent socket configurations with size 1 and size 2 port dimensions respectively, designed to receive the corresponding plug components. CZL-1PM and CZL-2PM variants are plug configurations that mate with their respective socket counterparts, with size 2 models providing higher flow rates and pressure handling capability. All variants feature identical stainless steel construction with EPDM sealing, but larger size 2 models offer reduced pressure drop and increased flow coefficient for high-demand pneumatic applications requiring maximum system efficiency.

What installation requirements and system compatibility considerations apply to Compact Zero Spill Cupla couplings?

Compact Zero Spill Cupla installation requires proper thread engagement torque specifications and system pressure testing to ensure leak-free operation in pneumatic circuits. The stainless steel couplings are compatible with compressed air systems operating up to 10 bar working pressure and require NPT or BSP threaded connections depending on regional standards. System compatibility includes verification of EPDM seal compatibility with process media, adequate clearance for coupling engagement, and proper hose routing to prevent mechanical stress on connection points. Installation must include provision for periodic inspection access and consideration of thermal expansion effects in systems experiencing temperature cycling between ambient and operating conditions.

What are the safety ratings, IP protection class, and operating parameter ranges for Compact Zero Spill Cupla systems?

Compact Zero Spill Cupla couplings operate safely within temperature ranges from -20°C to +150°C with working pressures up to 10 bar for pneumatic applications and higher ratings for hydraulic service. The stainless steel construction provides IP65 ingress protection against dust and water jets, ensuring reliable operation in industrial washdown environments. EPDM sealing elements maintain zero leakage performance across the full temperature range while resisting ozone degradation and chemical attack from standard pneumatic media. Safety factors are engineered to exceed 4:1 pressure rating margins, and the fail-safe design prevents accidental disconnection under system pressure, meeting industrial safety requirements for automated manufacturing equipment.

What maintenance schedule and service life expectations apply to Compact Zero Spill Cupla pneumatic couplings?

Compact Zero Spill Cupla maintenance schedules typically require visual inspection every 500 operating cycles or monthly intervals in continuous service applications to verify seal integrity and coupling engagement. The stainless steel construction provides service life exceeding 100,000 connection cycles under normal operating conditions, with EPDM sealing elements requiring replacement every 2-3 years depending on media compatibility and temperature exposure. Preventive maintenance includes periodic lubrication of coupling mechanisms with pneumatic-grade lubricants and pressure testing at 1.5 times working pressure annually. Inspection criteria focus on seal wear patterns, coupling body corrosion, and spring mechanism function to ensure continued zero-spill performance throughout the coupling's operational lifetime in industrial pneumatic systems.