Accutools TruBlu Starter Kit Extremely tough, ultra-smooth bored, yet the flexible wire reinforced PVC means it just won't kink or collapseTruBlu's ultra-smooth large bore reduces flow loss and other losses providing the fastest evacuation of any hose on the market todayTruBlu is the only system engineered for HVAC that uses industrial-rated vacuum hose as well as vacuum-rated KF fittings for quick hose configuration and vacuum tight connectionsPatent Pending KF fitting designed specifically for HVAC applications Evacuation Kit These hoses are freaky fast! TruBlu hose has a 3/4? internal diameter delivering 16 CFM of conductance speed at 1,000 microns. Evacuate 80x faster than 1/4? I.D. hoses and up to 6x faster than other “vacuum rated” hoses on the market today.The TruBlu hose is extremely tough, and ultra-smooth bored, yet the flexible wire reinforced PVC means it just won't kink or collapse. TruBlu is resistant to abrasion and crushing and can be knocked back to round if accidentally flattened. Additionally, the UV compounding has excellent weather resistance to provide years of reliable service.The proprietary polymer blend has extremely low air permeation, water vapor adhesion, and outgassing making this hose ideal for vacuum service. In short TruBlu's ultra-smooth large bore reduces flow loss and other losses providing the fastest evacuation of any hose on the market today.