Reliance Engineering & Electricals Corporation offers Pressure Rating Multi Port Gauge Valves. Reliance Engineering & Electricals Corporation is an ISO 9001:2000 certified company. Pressure Rating Multi Port Gauge Valves are extremely versatile featuring 3½ FNPT outlet ports as standard. Pressure Rating Multi Port Gauge Valves are used to calibrate, vent and isolate gauges and instruments. These multi port guage valves are available in various inlet port options with the other options of material and seat material.