Polytank Coffin Style Cold Water Cistern Loft Tanks Now Available Direct From The Central Depot Usually On A Next Day Service That Come Complete With A Snap On Lid, Polytank Byelaw 30 Kit including fitting Instructions With Insulation & Ties 22mm Brass Compression Tank Connector, 1/2″ Ball Valve Pack & 15mm 1/2″ angled Service Valve.