PANASONIC ET-SFR510 original filter for PANASONIC PT-DS20KE, PT-DS20KU, PT-DS20K, PT-DW17KE, PT-DW17KU, PT-DW17K, PT-DZ16KE, PT-DZ16KU, PT-DZ16K, PT-DZ21KE, PT-DZ21KU, PT-DZ21K