Is the DN5 Quick-Connect Brass Plug with Valve, Threaded, Series 21KB compatible with standard pneumatic and hydraulic hoses and fittings?

Yes. The DN5 Quick-Connect Brass Plug with Valve, Threaded, Series 21KB is compatible with standard pneumatic and many hydraulic hoses and fittings that use the Eurostandard DN5 (MINI) interface and BSP threaded connections. Its design features—double shut-off valves (in both plug and socket), BSP external or internal thread options, brass body with stainless steel internals, NBR seals, and a working pressure up to 35 bar—make it suitable for typical compressed air systems and low- to medium-pressure hydraulic applications within the stated temperature range (-20°C to +100°C). Limitations: confirm thread type (internal vs external BSP) and size match your hose/fitting standards; ensure system pressure does not exceed 35 bar; verify NBR compatibility with your specific hydraulic fluid (some aggressive fluids may require different seal materials).

Does the DN5 Quick-Connect Brass Plug with Valve, Threaded, Series 21KB support use with corrosive fluids or require special seals?

The DN5 Quick-Connect Brass Plug with Valve, Threaded, Series 21KB is constructed from brass with stainless steel springs and balls and uses NBR (nitrile) seals. This makes it suitable for many industrial fluids and provides good resistance to wear and general corrosion. However, NBR has limited chemical compatibility: it performs well with oils, fuels, water and hydraulic fluids but is not recommended for strong oxidizers, ketones, many esters, aromatic hydrocarbons, concentrated acids or bases, and some aggressive solvents. For corrosive fluids or applications involving aggressive chemicals, special elastomers (e.g. FKM/Viton, EPDM, PTFE) and sometimes different body materials (stainless steel) are typically required. Therefore, for corrosive media you should not assume compatibility—consult the fluid compatibility chart for NBR, or request alternative seal materials and/or a corrosion-resistant construction from the manufacturer before use.

DN5 Quick-Connect Brass Plug with Valve, Threaded, Series 21KB

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

Additional information

Material	B – brass (bronze)

The quick-release coupling plug of the 21KB series, designed in accordance with the Eurostandard DN5 (MINI), ensures reliable performance in demanding industrial environments where compact dimensions must go hand in hand with high flow efficiency and minimal pressure loss. Featuring a double shut-off system with valves integrated both in the socket and the plug, it guarantees secure and leak-free connections, while its one-handed operation significantly simplifies handling and accelerates workflows. Available with either external or internal BSP thread, this coupling is engineered from durable brass with stainless steel springs and balls, ensuring long-lasting resistance to wear and corrosion. The NBR sealing provides excellent tightness and durability, while the wide operating temperature range from -20°C to +100°C makes it suitable for diverse applications. With a working pressure of up to 35 bar, this compact yet powerful solution is the ideal choice for industries seeking efficiency, safety, and reliability in fluid transfer systems.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
RE-21SBAW17MPX	Quick coupling plug 21SB DN5, GZ 3/8" BSP, brass, NBR	-	35	In stock	Enquiry
RE-21SBIW10MPX	Quick coupling plug 21SB DN5, G 1/8" BSP, brass, NBR	-	35	In stock	Enquiry
RE-21SBIW13MPX	Quick coupling plug 21SB DN5, G 1/4" BSP, brass, NBR	-	35	In stock	Enquiry

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The quick-release coupling plug of the 21KB series, designed in accordance with the Eurostandard DN5 (MINI), ensures reliable performance in demanding industrial environments where compact dimensions must go hand in hand with high flow efficiency and minimal pressure loss. Featuring a double shut-off system with valves integrated both in the socket and the plug, it guarantees secure and leak-free connections, while its one-handed operation significantly simplifies handling and accelerates workflows. Available with either external or internal BSP thread, this coupling is engineered from durable brass with stainless steel springs and balls, ensuring long-lasting resistance to wear and corrosion. The NBR sealing provides excellent tightness and durability, while the wide operating temperature range from -20°C to +100°C makes it suitable for diverse applications. With a working pressure of up to 35 bar, this compact yet powerful solution is the ideal choice for industries seeking efficiency, safety, and reliability in fluid transfer systems.