Hydraulic valve.
Porsche 987 Mk1 Boxster '05-08
Porsche 987C Mk1 Cayman '06-08
Porsche 996 C2
Porsche 996 C4 / C4S '98-05 Exhaust (3.6L)
Porsche 996 Turbo '01-05 Exhaust
Porsche 997 Mk1 Carrera '05-08
Porsche 955 Cayenne S / Turbo '03-06 (4.5L)