Sealing ring for the oil thermostat. Also used for the oil filter housing flange and oil pressure sender cover.

To fit:
911 1965-1989 - oil thermostat
911 1972 - oil filter housing flange
911 (930) Turbo 1975-1989 – oil thermostat
911 (964) 1989-1994 – oil pressure sender cover
911 (993) 1994-1998 – oil pressure sender cover
914-6 1971-1972 – oil thermostat

This part number supersedes older part numbers:
- 99970105350, 99970105340, 99970717240