Commonly used on fuel cells as a vent -10 AN. This fitting makes it easy because this is the only fitting you need for it. ("no extra fittings"). Simply screw right onto the fitting coming out of the cell.
Black Anodized Billet Aluminum In-Tank Twin Fuel Pump for Fuel Cell EFI
For Fuel Cell Breather/Vent - Fuel Systems 10 AN Female Fitting Kit w/ Filter US
For Fuel Cell Breather / Vent -10 AN 90 Degree Bend Female Fitting w/ Filter Kit
For Fuel Cell Breather / Vent -10 AN 90 Degree Bend Female Fitting Kit w/ Filter
For Fuel Cell Breather / Vent 10 AN 90 Degree Bend Female Fitting & Filter Kit
For Fuel Cell Breather/Vent multiple vehicle 10 AN 90 Degree Bend Female Fitting