0115014 O-RING 1517-42.5.
They are used in 1, 1.5, and 2-inch KOSHIN Pumps to hermetic installation of the PUMP CASE to the FLANGE BRACKET.  
Material: NBR.
 1517-42.5
 
KOSHIN pumps Models powered by HONDA gasoline engine SEH-25H, SEH-40H, SEH-50X, STH-50X
KOSHIN pumps Models powered by KOSHIN gasoline engine SEV-50X, STV-50X
                                                                                                         
Suitable for other OEM Pumps powered by HONDA engine:
- PRAMAC MP36-2                           
- SDMO ST 2.36 C5, TR 2.36 C5
- Wacker Neuson PG2A, 
- Endress (old modes) EMP 205
 
Used in old KOSHIN Pumps Models: 
- powered by Robin-SUBARU engine SE-50X, STR-50EX
- powered by Mitsubishi engine SEM-50X, SEM-50V