Replacement primer bulb assembly.
These "EP" primer bulbs utilize special low permeation rubber to comply with the new EPA fuel seepage regulations.
They feature outstanding warm and cold weather flexibility, and have the look and feel of the primer bulbs you are used to.
Heavy on the technical side...
In 2011, the EPA required all primer bulbs and primer bulb assemblies to utilize low permeation components to reduce pollution causing hydrocarbon permeation through the hose and/or primer bulb by as much as 85%.
In response, Sierra introduced a new EPA approved primer bulb that exceeded the mandated permeation rate while maintaining Sierra’s traditional look, feel, and operational characteristics.
Manufactured from a unique FKM material, Sierra’s primer bulb meets both EPA and CARB standards, while providing outstanding warm/cold weather flexibility.