Does the Quick coupling plug with GW BSPT, NITTO KOHKI HI CUPLA, carbon steel require a specific flow direction from socket to plug for safe operation?

Quick coupling plug with GW BSPT, NITTO KOHKI HI CUPLA, carbon steel requires a specific flow direction for safe operation. According to the product description, the medium must flow from the socket to the plug. The plug is a nonâvalved type with internal BSPT thread, designed for connecting pneumatic tools; safe and intended operation depends on maintaining this socketâplug flow direction to ensure proper pressure handling, durability and vibration resistance at the stated working pressure and flow rates.

Can the Quick coupling plug with GW BSPT, NITTO KOHKI HI CUPLA, carbon steel be used with reverse flow (plug to socket) safely?

No. The Quick coupling plug with GW BSPT, NITTO KOHKI HI CUPLA, carbon steel is specified for flow from the socket to the plug only. It is a plug without a valve and is not designed for reverse flow (plug to socket). Using it in reverse risks leakage, loss of flow control and potential unsafe operation. Use a plug/socket designed for bidirectional flow or a plug with an internal valve to ensure safe reverse-flow operation.

Quick coupling plug with GW BSPT, NITTO KOHKI HI CUPLA, carbon steel

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

Additional information

Material	CS – steel (cast iron)

Nitto Kohki HI CUPLA series plug without valve with internal BSPT thread, featuring excellent durability and vibration resistance. Designed for connecting pneumatic tools to the air supply system. Material: carbon steel. Working pressure: 15 bar. 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-20PF-S	HI CUPLA quick coupling plug, BSPT 1/4" thread, chrome-plated steel	-	15	In stock	Enquiry
NK-30PF-S	HI CUPLA quick coupling plug, BSPT 3/8" thread, chrome-plated steel	-	15	In stock	Enquiry
NK-400PF-S	HI CUPLA quick coupling plug, BSPT 1/2" thread, chrome-plated steel	-	15	In stock	Enquiry
NK-40PF-S	HI CUPLA quick coupling plug, BSPT 1/2" thread, chrome-plated steel	-	15	In stock	Enquiry
NK-600PF-S	HI CUPLA quick coupling plug, BSPT 3/4" thread, chrome-plated steel	-	15	In stock	Enquiry
NK-800PF-S	HI CUPLA quick coupling plug, BSPT 1" thread, chrome-plated steel	-	15	In stock	Enquiry

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Nitto Kohki HI CUPLA series plug without valve with internal BSPT thread, featuring excellent durability and vibration resistance. Designed for connecting pneumatic tools to the air supply system. Material: carbon steel. Working pressure: 15 bar. 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.