This will fit any snow foam lance as a replacement gauze.
If your snow foam lance has stopped foaming properly then this could be your solution to fixing it, as soap scum settles in your lance due to not running / flushing it through after usage the soap scum can build up and block the gauze.
Simply slot out the metal pin from the black plastic nozzle cover and then slide it off. Screw apart the bit inside and then you will see the filter to be replaced.