The N.P.D.D Under The Name Of The National Youth Sports Center Of Agios Kosmas (E.A.K.N. Agios Kosmas) "Awarding Authority" Announces A Public Open Electronic Tender With The Criteria For Awarding The Most Economically Advantageous Offer, Only Based On Price, For The Assignment Of Technical Support Services Ie: Operation, Supervision And Maintenance Of Electromechanical Installations And Plumbing Installations, With A Validity Of Four (4) Months At The Headquarters Of The Facilities Of The National Youth Sports Center Agios Kosmas And Eight (8) Months At The Facilities Of The Former National Indoor Gym Piraeus P. Kapagerov, Of The "Awarding Authority" (Art. 57 Of Law 4002/2011), From The Posting Of The Contract.