meaning less power off the line but better high-speed cruising

This weld-in aluminum bung allows you to change or move your fuel valve / petcock location to wherever you desire on your gas tank

When running a custom air cleaner (such as a Lowbrow Louvered Air Cleaner or a Gasbox Dog Dish Air Cleaner) on a Harley-Davidson Evolution Big Twin or Sportsters engines or a Twin Cam engine

Have a large displacement or stroker motor

1/4 inch NPT Petcock Chrome - Straight Fork Tube Diameter_39MM meaning less power off theThese fuel petcocks have reserve and fit gas tanks with 1 4" NPT petcock bungs. Features a brass filter screen. The outlet is straight down and has a 5 16" hose barb.