Can a DN5 quick-connection plug with valve, threaded, brass, series 21KB be safely connected to a single shut-off socket?

No. The DN5 quick-connection plug with valve, threaded, brass, series 21KB (double shut-off) must not be connected to a single shut-off socket. The double shut-off design has a valve in both plug and socket; when paired with a single shut-off socket the mating valve will not open, preventing flow and risking improper sealing or damage. Use only matching double shut-off (Eurostandard DN5 MINI, series 21KB) couplings or ensure both plug and socket are of the same shut-off type.

Can DN5 quick-connection plug with valve, threaded, brass, series 21KB be used with single-shutoff sockets from other series?

No - DN5 quick-connection plug with valve, threaded, brass, series 21KB cannot be used with single-shutoff sockets from other series. The double shut-off design means both plug and socket have valves; if mated with a single-shutoff socket the valve in the plug will not open, preventing flow. Use only compatible double-shutoff sockets to ensure proper operation.

Can DN5 quick-connection plug with valve, threaded, brass, series 21KB be interchanged between internal and external BSP threaded sockets?

No. DN5 quick-connection plug with valve, threaded, brass, series 21KB (double shut-off) cannot be interchanged with a single shut-off counterpart in practice. Both plug and socket must be of the double shut-off type (valve in both plug and socket) to open properly on connection. Although the series offers versions with external or internal BSP threads, the critical incompatibility is between double shut-off and single shut-off designs: connecting a double shut-off plug to a single shut-off socket (or vice versa) will prevent the valve from opening, blocking flow. For correct function, match double shut-off plug and socket (both 21KB double shut-off) and ensure BSP thread types (internal/external) are paired appropriately.

DN5 quick-connection plug with valve, threaded, brass, series 21KB

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

Additional information

Material	B – brass (bronze)

Quick-release coupling plug, double shut-off, Eurostandard DN5 (MINI), series 21KB with external or internal BSP thread. The double shut-off version has a valve in the socket and in the plug, and should not be connected with the single shut-off version, as the valve will not open. Widely used in the industry where small dimensions are required with high flow efficiency and low pressure drop. One-handed operation. Working pressure: 35 bar. Material: brass, stainless steel (springs and balls). Sealing: NBR. Operating temperature: from -20°C to +100°C.

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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Quick-release coupling plug, double shut-off, Eurostandard DN5 (MINI), series 21KB with external or internal BSP thread. The double shut-off version has a valve in the socket and in the plug, and should not be connected with the single shut-off version, as the valve will not open. Widely used in the industry where small dimensions are required with high flow efficiency and low pressure drop. One-handed operation. Working pressure: 35 bar. Material: brass, stainless steel (springs and balls). Sealing: NBR. Operating temperature: from -20°C to +100°C.