Cover of Valves and tubes

It is agreed and understood that otherwise subject to the terms, exclusions, provisions and conditions contained in the Policy or endorsed thereon and subject to the Insured having paid the agreed extra premium, this insurance shall be extended to include loss of or damage to valves and tubes. Indemnification shall be limited to the actual value of such items immediately prior to the occurrence of the loss or damage, including ordinary freight, erection costs and custom duties and dues, if any.