Heater hose size?

Believe it or not, the o.e. Corbin Clamps do a better job of sealing the hoses. Unlike common threaded clamps which will pinch and cut into the hosen as you tighten it up, the whole corbin clamp puts equal tension on the hose and does not pinch or cut and is much easier to instal with just a set of corbin pliers. Just a thought to consider. The factory clamps were not a downgrade to save money.