GlowShift’s Fuel Filter Bleeder Screw for GM 6.6L Duramax upgrades the factory plastic bleeder screw to a durable, billet aluminum bleeder screw that is designed to last. This bleeder screw is compatible with 2001-2016 6.6L Duramax diesel engines, as well as LB7, LLY, LBZ, LMM and LML engines. The thread on this bleeder screw features a size of 1/8-27 NPT with a machined air channel that helps “bleed” air out of the fuel system. This bleeder screw also features a diesel fuel rated Viton O-ring that provides a leak-free seal. GlowShift includes a one-year limited warranty and free lifetime technical support with each purchase.