Check the listing for details. Ross Interposed Pressure Regulator - 1300K91. Condition: New – Open box. Listed at 60.00 USD. The Ross Interposed Pressure Regulator - 1300K91 is a precision instrument designed to regulate and control the pressure of compressed air in various industrial applications. This pressure regulator is specifically engineered to ensure a steady and accurate output pressure, making it ideal for use in hydraulics, pneumatics, pumps, and plumbing systems. With its durable construction and reliable performance, the Ross Interposed Pressure Regulator is a valuable tool for maintaining optimal air pressure levels in a range of business and industrial settings.