Draper expert 46mm 1 2 square drive waterpump wrench draper expert 31487 b i expert quality i b manufactured from en8 carbon steel plate hardened and tempered with zinc plated finish adjusts the tension of the timing belt by rotating the waterpump suitable for gm vauxhall opel engines size 1 6 1 7d and 1 8 pre 1987 and 2 0 1987 onwards and daewoo espero 1 8 and 2 0 sohc display packed draper expert 31487 46mm 1 2 square drive waterpump wrench