Articles in this category Do I need to use a GAS IT D.G.I Filter ? When it comes to the filtration of LPG / Autogas, people think its not necessary, because gas is green right? Any type of petroleum based ... The thread on my D.G.I. Filter seems tight when I try to use it, is that right? This instruction for spanner joining and separation is only applicable when using the individually bought item D.G.I. filters only. If your D.G.I. Filter comes pre fitted to the UK bayonet, this...