Heater cores 8E1820031 / Mahle/Behr/Clevite AH7000S / Nissens 70226 / etc. Designed forAudi B6 & B7 A4 / S4 / RS4 heater core connections. This purpose-built installation tool is designed specifically for the B6 & B7 (8E) platform heater core connection and eliminates the pain of clamp installation.