NOS 90 Degree Nitrous Bottle Blowdown Tube - Blue # 16160NOSNOS 90 Degree Nitrous Bottle Blowdown Tube Blue # 16160NOS NOS 90 degree bend nitrous bottle blowdown tubes are made from 1 2" 6061 T6 aluminum and available in blue or black anodized finishes. This type of tube is necessary when mounting a nitrous bottle inside the passenger compartment of a vehicle. It directs the nitrous outside of the vehicle in the case of an over pressurization event. The 90 degree bend may be necessary for some nitrous bottle