This is a Genuine Meyer OE 21827 1/2" Drain Plug with O-Ring for E46, E47 Pump
Used on Meyer E46, E46H, E47 and E47H Pump Units. It is the smaller one for the plow pumps with the 2 hole base. If you have the larger plug you will need, Click21999. So please make sure yours is the 1/2" before ordering.