Using materials resistant to the chemistry of today's fuels, this is designed to remain pliable longer. Bulb will perform at 5°F after 6 weeks of exposure to fuel. 2011 EPA certified, low-permeation bulb. For use with gray color 5/16" I.D. fuel line and 3/8" I.D. fuel line. Bulb has the molded EPA compliance statement "EPA-MERC-PB15". Two hose clamps are included. Performs at 5°F after 6 weeks of fuel exposure EPA certified, low-permeation bulb | Primer Bulb in Grey