Does the Quick coupling socket with GZ BSPT valve, NITTO KOHKI HI CUPLA, carbon steel require flow to go from socket to plug only?

Quick coupling socket with GZ BSPT valve, NITTO KOHKI HI CUPLA, carbon steel . Yes. The product description explicitly states "the medium must flow from the socket to the plug," so the coupling is designed for flow in that direction only. Operating parameters (working pressure 15 bar, specified flow rates at 5 bar, temperature range â20Â°C to +80Â°C) assume socket-to-plug flow; reverse flow is not recommended.

Can the Quick coupling socket with GZ BSPT valve, NITTO KOHKI HI CUPLA, carbon steel be installed in systems where airflow direction reverses?

Quick coupling socket with GZ BSPT valve, NITTO KOHKI HI CUPLA, carbon steel cannot be used in systems where airflow direction reverses. Product description explicitly states the medium must flow from the socket to the plug; reverse flow would violate design intent, risk leakage or malfunction of the internal valve, and may compromise sealing and safety despite the socketâs durability and vibration resistance. Use a coupler rated for bidirectional flow or redesign the system to ensure consistent flow direction.

Quick coupling socket with GZ BSPT valve, 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 socket with external BSPT thread, featuring excellent durability and vibration resistance. Designed for connecting pneumatic tools to air installations. Material: carbon 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-20SM-S	HI CUPLA quick coupling socket, GZ BSPT 1/4", chrome-plated steel	-	15	In stock	Enquiry
NK-30SM-S	HI CUPLA quick coupling socket, GZ BSPT 3/8", chrome-plated steel	-	15	In stock	Enquiry
NK-400SM-S	HI CUPLA quick coupling socket, GZ BSPT 1/2", chrome-plated steel	-	15	In stock	Enquiry
NK-40SM-S	HI CUPLA quick coupling socket, GZ BSPT 1/2", chrome-plated steel	-	15	In stock	Enquiry
NK-600SM-S	HI CUPLA quick coupling socket, GZ BSPT 3/4", chrome-plated steel	-	15	In stock	Enquiry
NK-800SM-S	HI CUPLA quick coupling socket, GZ BSPT 1", chrome-plated steel	-	15	In stock	Enquiry

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Nitto Kohki HI CUPLA series socket with external BSPT thread, featuring excellent durability and vibration resistance. Designed for connecting pneumatic tools to air installations. Material: carbon 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.