An intermediate storage tank assembly (20) comprising a filling line (26) a filling machine (22) and an end-valve assembly. The intermediate storage tank assembly (20) comprises a switch (24) being arranged between said filling machine (22) and said end-valve assembly (23) for detecting a level of product and in response thereto stop a priming of said intermediates storage tank (21) thereby preventing product from reaching said end-valve assembly. A method for priming an intermediate storage tank assembly,a switch to be installed between a filling machine and an end-valve assembly of an intermediate storage tank assembly, a method for installing a switch in an intermediate storage tank assembly and a prime valve to be installed between a switch and an end-valve assembly of an intermediate storage tank assembly are also disclosed.Ensemble réservoir de stockage intermédiaire (20) comprenant une conduite de remplissage (26) une machine de remplissage (22) et un ensemble clapet dextrémité. Lensemble réservoir de stockage intermédiaire (20) comprend un commutateur (24) agencé entre ladite machine de remplissage (22) et ledit ensemble clapet dextrémité (23) pour détecter un niveau de produit et, en réponse à celui-ci, arrêter un amorçage dudit réservoir de stockage intermédiaire (21) empêchant de ce fait un produit datteindre ledit ensemble clapet dextrémité.
