Home » Shillafire » Female to Male Coupling (NH Thread) Female to Male Coupling (NH Thread) The coupling is used when the connector specification is different or when requiring extension in length. One side is female thread and other with male thread. Each can be connected to the male and female thread. Categories: Shillafire, Connector Tags: Connector, Fire Fighting Equipment, Shillafire You may also like… Coupling for Fire Water Line (PT x NH) Female to Male Coupling (NH Thread, Swivel) Double Female Coupling (NH Standard) Double Male Coupling (NH Standard) Hose Coupling (NH Thread) Related products Fire Extinguisher – 205 ABC Fire Extinguisher – 305 ABC Fire Hose – Hose Reel Hydrant Box Type – C Deluge Valve System