This part fits:
Worcester Greenstar 12I FSN NG System
Worcester Greenstar 12I FSp LPG System
Worcester Greenstar 24I FSN NG System
Worcester Greenstar 24I FSp LPG System
Worcester Greenstar 24I Junior FSN NG
Worcester Greenstar 24I Junior FSp LPG
Worcester Greenstar 25SI FSN NG Combi
Worcester Greenstar 25SI FSp LPG Combi
Worcester Greenstar 28I Junior FSN NG
Worcester Greenstar 28I Junior FSp LPG
Worcester Greenstar 30SI FSN NG Combi
Worcester Greenstar 30SI FSp LPG Combi