Grundfos 00ID8566 300 Psi Liquid Filled Pressure Gauge. This CR In-Line Pump Liquid Filled Pressure Gauge is designed to bring unmatched performance and accuracy in a wide range of industrial and commercial applications. This Liquid Filled Pressure Gauge can be adapted to applications ranging from simple to heavy-duty industrial settings. Other applications include; water systems, cleaning systems, water treatment, boiler feed to temperature control. This Grundfos 00ID8566 300 Psi Liquid Filled Pressure Gauge is specifically designed for CR Series Pumps. The Gauge is an extremely durable product designed to protect your system and save money. The Pump is designed for 300 PSI systems, and features a threaded connection.