Fast recovery and evacuation: NAVAC NHB2 Refrigerant hose has a 1/2 inch internal diameter for faster evacuation and recovery of an HVAC system. It is 6 feet long and black in color. Reliable HVAC Hose: The NHB2 High-flow Refrigerant Hose can withstand 3200 psi burst pressure and operates at 640 psi working pressure. Safe and efficient: NHB2 Hose is made with a 4-layer construction for low permeation. This ensures that refrigerants don’t escape into the atmosphere during the process. Essential HVAC Tool: This hose connects 1/2" fittings to 1/4“ fittings. Technicians use this to perform refrigerant recovery and pull the vacuum from an HVAC system. It is vacuum-rated to 20 microns. Encouraging smart work: We want the tools in your NHB2 Refrigerant Hose to last as long as they can, which is why we are offering a 1-year warranty. NAVAC always wants to empower you to work smarter!