Can the Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC be connected or disconnected under residual pressure up to 50 bar without tools?

Yes. The Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC can be connected and disconnected under residual (static) pressure up to 50 bar without tools. Its brass body and valve design minimize leakage and air inclusion, and the plug sleeve with butterfly handles allows very quick, tool-free operation. The product description explicitly permits screwing the quick coupling under residual pressure up to 50 bar.

Is the Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC suitable for use in temperatures down to -40Â°C?

Yes. The Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC is specified for operation from -40Â°C to +106Â°C and uses NBR seals rated for that range, so it is suitable for use in temperatures down to -40Â°C.

Does the Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC resist corrosion in coastal environments?

Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC offers good general resistance to corrosion and changing weather conditions thanks to its brass body, as stated in the product description. Brass performs well against atmospheric corrosion and typical outdoor exposures. However, coastal environments pose additional challenges due to high salt (chloride) content, which accelerates corrosionâparticularly for ferrous components. The plug sleeve on this model is made of galvanized steel, which provides some protection but is more vulnerable to accelerated corrosion in salty, marine atmospheres than stainless steel or specially coated alloys. NBR seals are generally resistant to oils and a broad temperature range but do not protect metal parts from salt-induced corrosion. Conclusion: The brass body gives the Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC better-than-average weather resistance, but the presence of galvanized steel parts means it may not provide long-term, maintenance-free performance in aggressive coastal/marine environments. For reliable long-term use on the coast, consider additional protective measures (regular rinsing with fresh water, corrosion inhibitors) or a version with stainless steel components or marine-grade coatings.

Screwed quick-connector, plug with GW NPT of brass, HOLMBURY type WSC

All products, Hydraulic quick couplings/

Additional information

Material	B – brass (bronze)

HQ WSC quick coupling plug, screw-on, with a valve with internal NPT thread for use in hydraulic vehicle systems. The body made of brass ensures excellent resistance to changing weather conditions. The valve design ensures minimal medium leakage and air inclusion during connection and disconnection. The plug sleeve equipped with butterfly handles allows for very quick and easy connection and disconnection of the quick coupling without the need for tools. It is permissible to screw the quick coupling under residual pressure up to 50 bar (static pressure remaining in the system after the drive is turned off). Material: brass (body), galvanized steel (plug sleeve). Sealing: NBR. Operating temperature: from -40°C to +106°C. Working pressure: up to 210 bar (depending on size). Flow is given for a pressure drop of 3 bar.

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
HQ-WSC19-M-12N	WSC DN19 plug with 3/4" NPT female thread	-	210
HQ-WSC25-M-16N	WSC DN25 plug with 1" NPT female thread	-	210
HQ-WSC32-M-20N	WSC DN32 plug with 1.1/4" NPT female thread	-	190

HQ WSC quick coupling plug, screw-on, with a valve with internal NPT thread for use in hydraulic vehicle systems. The body made of brass ensures excellent resistance to changing weather conditions. The valve design ensures minimal medium leakage and air inclusion during connection and disconnection. The plug sleeve equipped with butterfly handles allows for very quick and easy connection and disconnection of the quick coupling without the need for tools. It is permissible to screw the quick coupling under residual pressure up to 50 bar (static pressure remaining in the system after the drive is turned off). Material: brass (body), galvanized steel (plug sleeve). Sealing: NBR. Operating temperature: from -40°C to +106°C. Working pressure: up to 210 bar (depending on size). Flow is given for a pressure drop of 3 bar.