Paper cartridge filter with larger filter surface, standard for NT 48/1 and optional for NT 27/1/Me Advanced.Compatible with:NT 27/1NT 27/1NT 27/1 AdvancedNT 27/1 Advanced ProfessionalNT 27/1 Advanced ProfessionalNT 27/1 MeNT 27/1 Me AdvancedNT 27/1 Me Advanced ProfessionalNT 27/1 Me Advanced ProfessionalNT 27/1 Me ProfessionalNT 27/1 ProfessionalNT 27/1 ProfessionalNT 48/1NT 48/1 Professional