Can the Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, AISI 304 steel be used with media flow from plug to socket or must it always flow from socket to plug?

Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, AISI 304 steel must have the medium flowing from the socket to the plug. According to the product description and the built-in GW BSPT valve design, flow direction is specified: the medium must flow from the socket to the plug; it is not intended to be used with flow from plug to socket. Using it in reverse can prevent proper valve operation, reduce performance and sealing, and may risk leakage or damage.

Can Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, AISI 304 steel be used with flow from plug to socket or must flow be from socket to plug?

Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, AISI 304 steel must have the medium flow from the socket to the plug. The product description explicitly notes: "the medium must flow from the socket to the plug." Using flow from plug to socket would violate the designed flow direction and may impair sealing, valve function and safety.

Is the Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, AISI 304 steel suitable for reverse flow (plug to socket)?

No. Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, AISI 304 steel is not suitable for reverse flow (plug to socket). The product description explicitly states: the medium must flow from the socket to the plug. Using it in reverse risks malfunction, reduced performance and possible leakage or valve failure. Use a coupling specified for reverse flow or consult the manufacturer for an alternative model.

Quick coupling socket with GW BSPT 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 internal BSPT thread, 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	DN	BAR	Availability	Actions
NK-20SF-SS	HI CUPLA quick coupling socket, BSPT 1/4" thread, AISI 304	-	15	In stock	Enquiry
NK-30SF-SS	HI CUPLA quick coupling socket, BSPT 3/8" thread, AISI 304	-	15	In stock	Enquiry
NK-400SF-SS	HI CUPLA quick coupling socket, BSPT 1/2" thread, AISI 304	-	15	In stock	Enquiry
NK-40SF-SS	HI CUPLA quick coupling socket, BSPT 1/2" thread, AISI 304	-	15	In stock	Enquiry
NK-600SF-SS	HI CUPLA quick coupling socket, BSPT 3/4" thread, AISI 304	-	15	In stock	Enquiry
NK-800SF-SS	HI CUPLA quick coupling socket, BSPT 1" thread, AISI 304	-	15	In stock	Enquiry

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Nitto Kohki HI CUPLA series socket with internal BSPT thread, 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.