This part fits:
Worcester 280 NG FSN Combi
Worcester 280 LPG FSp Combi
Worcester CDI 28 LPG FSp Combi
Worcester CDI 28 NG FSN Combi
Worcester 28I NG FSN Combi
Worcester Greenstar 28I Junior FSN NG
Worcester Greenstar 28I Junior FSp LPG
Worcester Hiflo 4.5 BSN NG Combi
Worcester Hiflo 4.5 OSN NG Combi