Electronic Open Public Tender For The Selection Of A Contractor For The "Piraeus Open Water 1896" Service For The Years 2026-2028 With A Budget Of €159,000 Plus Vat With The Criterion Of Awarding The Most Economically Advantageous Offer Based On The Best Quality-Price Ratio In Accordance With The Provisions Of Law 4412/2016 In The Context Of Sub-Project 4 "Piraeus Open Water 1896" Of The Act "Program Of Sports Events And Activities Of The Municipality Of Piraeus 2026-2028" And Mis Code 6056812