H&R 60mm ID Single Race Spring Length 100mm Spring Rate 90 N/mm or 514 lbs/inch - ZF100-090 fits_1999.5-2005`Volkswagen`Golf Vacuum Valve System: Reliable and

Vacuum Valve System: Reliable and responsive

so you can count on them to keep your coolant flowing

Magnetic drain plugs on both end tanks ensure easy draining

59% cumulative efficiency (independently tested)

75" ID springs

H&R 60mm ID Single Race Spring Length 100mm Spring Rate 90 N/mm or 514 lbs/inch - ZF100-090 fits_1999.5-2005`Volkswagen`Golf Vacuum Valve System: Reliable andH&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and