D50303200000 is listed in DICSA's technical catalogue under Low pressure fittings / BSP Fttings / BSP Nut.
Check the exact accessory reference, dimensions and installation arrangement for the intended assembly.
Source specifications: Material: Mild Steel; Port 1 thread: 2" BSP.
Use the catalogue drawing and exact part reference to check connection geometry, hose or tube compatibility, and installation requirements.
