Volkswagen Passat 1995 Official Factory Repair Manual page 2177

Secondary Air Injection (AIR) system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.26.2
Page 5 of 18
15 - O-ring
Always replace
16 - Air channel
In cylinder head
26-15
12/6/2004