Manufacturing offers its O-Seal valve system, which is designed for leak-proof reliability and precision flow control in liquids or gases. The shutoff, needle, check and stop check valves are rated to 6,000 psi and will function from -65 degrees F (-54 degrees C) to 400 degrees F (204 degrees C) depending on the seal material. The product includes a complete interchangeable valve cartridge with a removable seat. This feature enables users to change from any of the four basic O-Seal cartridge designs at will without compromising its leak-proofing.