The elevated pressure nitrogen gas filling system protects the transformer oil in the main tank from both oxidation and absorption as well, Of moisture as maintains the superior standard of the insulating oil. Specifications inlet connection, Bs n2 standard bull nose connection outlet connection, Flange dn15/as per system connection material, Ss 304/316 system inlet pressure, 250 bar 3625 psi system outlet pressure, 0 to 0. 68 bar 10 psi primary regulatorinput pressure, 0 to250 bar 3625 psi output pressure, 0 to 3. 5 bar 50 psi secondary regulatorinput pressure, 0 to 3. 5 bar 50 psi output pressure levels starting at 0 to 0. 68 bar 10 psi