http://thietbitudong.ansvietnam.com/  
CSF Inox S.P.A Vietnam SPARES FOR PUMP CS40-210-2-12.5/BTW21 S/N C062878
AND FOR CS50-210-2-15/BTW21 S/N C062879:
CSF Inox S.P.A Vietnam 1U28DS05RZW
TEN.UNIT5  XWXWRZW D.28 DES CLTR
Composite
SNG SEAL U5 TC/CA/FKM1 d.28R, SLOT TAIL  - REF. 7
CSF Inox S.P.A Vietnam RAAGT6795F
O-RING FEP  6795 SIL+PTFE FDA-3A-USPVI
. 202,56X5,34
FEP (SIL+PTFE) / .
O-RING  6795 FDA    - REF. 18
CSF Inox S.P.A Vietnam RAAGT2112F
O-RING FEP  2112 SIL+PTFE FDA-3A-USPVI
. 28,30X1,78
FEP (SIL+PTFE) / .
O-RING 2112 FDA    - REF. 62