Roller Press Water Tank Drain Plug
Delivery: 3-4 Working Day(s) (Next day optional)
Expected Delivery Date is Thursday, September 23rd
As you can see from the image this is the Pfaff roller press water tank drain screw for 580 and 560 roller press series.
The float (not included) sits on the pin on the inside of this drain screw cap.
The float can be purchased https://www.sewingmachinesales.co.uk/sewingmachineparts/steam-press-parts/pfaff-roller-press-float.html