The Duff-Norton 1900 Series Rotary Union® comes with the highest psi ratings of any rotary union on the market, the company states. Developed for very high-pressure applications, up to 10, 150 psi and with maximum temperature ratings up to 246F, the 1900 Series are ideal for filtration systems, dryer drums, extruders and cooling and heating coils. Standard models feature nickel treated carbon steel construction: stainless steel is also available.