Fire Hose Couplings — UNE23400 Quick-Connect Couplers

A: UNE23400-1 and UNE23400-5 are the Spanish standards that define the "Barcelona-type" fire coupling - the claw diameter, engagement angle and sealing face that let couplers from different manufacturers connect and seal together. Building to this standard means our hose-tail, BSPP and blank-cap parts will mate with existing Barcelona-type equipment already in service.

A: Forged aluminum is the toughest option and is typically specified for couplers mounted on fire engines and pumps, where impact and repeated hard connection are routine. Cast aluminum is the standard choice for hydrant outlets and cabinet fittings where cost and volume matter more than peak impact strength. Brass is worth the upgrade wherever the fitting sits in salt air, wash-down chemicals, or constant wet/dry cycling - coastal stations, ports and marine vessels being the common cases.

A: Yes - the claw face and dimensions are the same across ALU-F, ALU-C and BR versions of a given DN size, so material choice on either side of the joint doesn't affect the connection. Mixing materials is a normal way to put a more corrosion-resistant coupler only where it's actually needed, without re-speccing the whole hose line.

A: NBR (nitrile rubber) is used across this range for its resistance to water, mild fuels and oils, and general outdoor weathering, and it's fitted as standard on every washer, seal and gasket in the catalog. Like any elastomer seal it's a wear item - inspect it at scheduled hose testing and replace it if it's cracked, flattened or no longer seating cleanly, rather than waiting for a leak to show up under pressure.

A: The DN25–DN75 range shown here covers the sizes we run as standard stock, but the tooling supports other thread types, claw diameters and branding for qualifying project volumes. Send us the outlet drawing or existing coupling sample and our sales engineers will confirm lead time, minimum order quantity and pricing for a custom run.