Does the Quick coupling socket with hose end and valve, NITTO KOHKI HI CUPLA, AISI 304 steel require a specific flow direction (socket to plug) during operation?

Yes. The Quick coupling socket with hose end and valve, NITTO KOHKI HI CUPLA, AISI 304 steel requires a specific flow direction: the medium must flow from the socket to the plug. Operating parameters (working pressure, temperature range, and listed flow rates) are specified with that direction in mind, so install and use accordingly to ensure correct sealing, valve function and rated performance.

Can the Quick coupling socket with hose end and valve, NITTO KOHKI HI CUPLA, AISI 304 steel be used if airflow direction is reversed (plug to socket)?

No - the Quick coupling socket with hose end and valve, NITTO KOHKI HI CUPLA, AISI 304 steel is designed for flow from the socket to the plug. The manufacturerâs note specifies the medium must flow in that direction; reversing flow (plug to socket) can impair valve operation, seal performance and safety, and may cause reduced flow or leakage. Use as intended or consult NITTO KOHKI for a compatible reverse-flow model.

Quick coupling socket with hose end and valve, NITTO KOHKI HI CUPLA, AISI 304 steel

All products, General-purpose low-pressure quick couplings/

Additional information

Material	SS – stainless steel

Nitto Kohki HI CUPLA series socket with a hose end, featuring excellent durability and vibration resistance. Designed for connecting pneumatic tools to the air supply system. Material: AISI 304 steel. Working pressure: 15 bar. Operating temperature: from -20°C to +80°C (NBR). Flow rate: 4000 l/min (1″), 3200 l/min (3/4″), 2600 l/min (1/2″), 1600 l/min (3/8″), 1000 l/min (1/4″) at a pressure of 5 bar. Note: the medium must flow from the socket to the plug.

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
NK-20SH-SS	HI CUPLA quick coupling socket, for 1/4" hose, AISI 304	-	15
NK-30SH-SS	HI CUPLA quick coupling socket, for 3/8" hose, AISI 304	-	15
NK-400SH-SS	HI CUPLA quick coupling socket, for 1/2" hose, AISI 304	-	15
NK-40SH-SS	HI CUPLA quick coupling socket, for 1/2" hose, AISI 304	-	15
NK-600SH-SS	HI CUPLA quick coupling socket, for 3/4" hose, AISI 304	-	15
NK-800SH-SS	HI CUPLA quick coupling socket, for 1" hose, AISI 304	-	15

Nitto Kohki HI CUPLA series socket with a hose end, featuring excellent durability and vibration resistance. Designed for connecting pneumatic tools to the air supply system. Material: AISI 304 steel. Working pressure: 15 bar. Operating temperature: from -20°C to +80°C (NBR). Flow rate: 4000 l/min (1″), 3200 l/min (3/4″), 2600 l/min (1/2″), 1600 l/min (3/8″), 1000 l/min (1/4″) at a pressure of 5 bar. Note: the medium must flow from the socket to the plug.