Nordson series160 and series 161 plastic static mixer nozzles are used for cartridge dispensing and machine (meter mix) dispensing. These mixing nozzles have a bell inlet which fit Nordson Valve manifolds (machine mixing) and large volume cartridges - greater than 50 ml. This mixer series includes the following: 160, 161, 160A, 160AN, 161A & 161AN. A metal jacket is recommended if the working pressure inside the nozzle exceeds 150 psi (10 bar) (only used with meter mix valves or manifolds). A metal jacket is recommended if the working pressure inside the nozzle exceeds 150 psi (10 bar) (only used with meter mix valves or manifolds). A metal jacket is recommended if the working pressure inside the nozzle exceeds 150 psi (10 bar) (only used with meter mix valves or manifolds).