Conical style valve spring as designed and fitted to most Aussiespeed supercharger manifolds.
The spring is made in Australia and when set at the correct installed height has around 18lbs of pressure per spring.
Approximate dimensions of the spring are 53mm free length, 28mm bottom, 14mm top.
When used with AS0219 a top retainer is not needed as the spring is retained by the head of the bolt.
You are buying 1 only spring