A must when installing your stock or upgraded injectors. OEM, fits A3, B4, and A4 ALH models. Sold as a set of 4
 
Volkswagen
Golf TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
Jetta TDI MkIII (A3 chassis) w/ AHU Engine (1997-1999)
Jetta TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
Jetta Wagon TDI (A4 chassis) w/ ALH Engine (2002-2003)
New Beetle TDI (A4 chassis) w/ ALH Engine (1998-2003)
Passat TDI (B4 chassis) w/ AHU/1Z Engine (1996-1997)