These are for use with low pressure fluids to permit easier adjustment, alignment, or handling of a hose - they are not designed for high frequency swivel on robotics or automated systems. Available in an aluminum or stainless body (1-1/4" through 6" sizes) and either a Buna-N or Viton seal. As a general guide only, the 1-1/4"-4" sizes are recommended for a maximum 150 psi at room temperature, and 75 psi in 6".