Northeast Frontier Railway has published Supply Of non return valve 3/4 inch designed , non return valve 3/4 inch designed for pressurised flushing system of make/ m odel : spac item code spac 0010906 or similar as per mmdts 19027. rev.01. [ warranty period: 3 0 months after the date of delivery ] ]. Last date of submission for this tender is 2026-03-13. This is a Non Return Valve tender in Dibrugarh, Assam