This filter fits the following generators: Emerald I - BGEL - Spec Letter B-E; Emerald III - Begin 9/87 NHEL - Spec Letter A-F; Emerald III - NHEL - Spec Letter G-P; Emerald III - NHEL - Spec Letter J; Emerald III - NHL - Spec Letter P; Emerald III - Prior to 9/87 NHEL - Spec Letter A-F; Marquis - LP/NHM - Spec Letter ALL.
