The Dual Model 40510D 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 utilizes a standard 1 -12UNF mounting thread 3/4 flow required for most fuel dispensers. The 40510D is designed to detect both phase separation in alchol-gasoline blended fuels with 15 % maximum alcohol 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.