The Dual Model 40510D-AD is a phase separation detecting and water-sensing, particulate removing filter with 10 micron cellulose media which is recommended for gasoline and alcohol blended fuels when a higher cleanliness level is required. The 40510D-AD utilizes a standard 1.5 -16 UNF mounting thread 1 inch flow required for high flow fuel dispensers. The 40510D-AD is designed to detect both phase separation in alchol-gasoline blended fuels with 15 % maximum alcohol and and water in gasoline. The model 40510D filter eliminates the need to change filters if you change fuels. It utilizes an epoxy coated interior shell to eliminate oxidation which can cause pin-hole leaks from the inside. PetroClear filters are not to be used with aviation fuels.