Dometic SMEV sink plug replacement

Replacement for the silvery plastic sink plug usually found in mobile homes/ caravans. To be used in conjunction with an O-ring with size about diam 30mm width 2.5mm (actual diameter of the sink hole is 33mm, but a bit tighter O-ring probably works better. Mine was 28mm/2.8mm).
Can be altered with parameters in the Fusion360 file, parameter "oring_djup" is depth of slit for oring and "oring_höjd" is height of the oring-slit.