Attwood Low Permeation Primer Bulbs are engineered with a three-layer design that surpasses EPA standards for fuel evaporation, ensuring reliable performance without ballooning or collapsing. Compatible with all OEM engines from 1 to 350 HP and suitable for ethanol-blended fuels, these bulbs come in 1/4", 5/16", and 3/8" interior diameters. Certified by EPA and CARB, and meeting ABYC H-25 and USCG standards, they operate efficiently between 18°F and 122°F. Backed by a two-year warranty, they provide durable and compliant fuel priming for marine applications.