Water pipe return line.
Porsche 987 Boxster MKI '05-08
Porsche 987 Boxster MKII '09-12
Porsche 987C Cayman MKI '06-08
Porsche 987C Cayman MKII '09-12
Porsche 997 Carrera 3.6L / 3.8L MKI '05-08 COUPE / CABRIO
Porsche 997 Carrera 3.6L / 3.8L MKII '09-12 COUPE / CABRIO / TARGA
Porsche 997 TURBO / TURBO S / GT2 / GT2 RS '07-
Porsche 997 GT3 '07-11