Drain socket with inner and outer flange with non-return valve and retained plug (which is installed on the inside of the transom).
Retained by four screws (not included). Available in black.
Inner flange dimensions: 75mm x 52mm
Outer flange dimensions: 75mm x 52mm
Cutout diameter: 40
Internal diameter: 34mm
Suitable for transom thickness: 20-25mm