Ford Escort RS Turbo S1 / S2 - Header Tank Hand made coolant tank to replace the plastic OE part. All alloy construction with the benefit of rounded edges. This improves reliability as folded tanks with square edges are more likely to crack at the joint under pressure. All skilfully assembled by our in house fabricators. This is a direct replacement for O.E. tank with billet sight glass fitted to make it easy to check your coolant level on S2 models Available in either satin silver, Pro black or mirror polished. 3 versions avaliable: S1 - for Series 1 (MK3) models with the Coolant Level Sensor S2 - for Series 2 (MK4) model up to August 1989 S2 90 Spec - for Series 2 (MK4) for cars from September 1989 onwards