Can I use 220mm interface pad for soft fillers for lhs 2 planex with my LHS 225 planex easy?

No. You cant use backing pad 205415 with the PLANEX Easy sander. We recommend you use part number 202546 Soft backing pad for the PLANEX Easy. The Soft backing pad (202546 ) doesn't require an interface pad.

For the full range of Festool
sanding accessories for the PLANEX Easy see this link: