EPA/CARB compliant assemblies use a compounded, tough and pliable UV-resistant hose. Promotes maximum fuel flow. All fuel lines, primer bulbs, and fittings are 3/8″ unless noted otherwise. Includes fittings built to OEM specifications for replacement parts. Uses O-ring construction on all fittings for tight, leak-free connections. B1-15 rated fuel lines are for above deck use only, A1-15 rated fuel lines are fire resistant and may be used in above or below deck applications.