Honeywell Brand Single Valve Standing Pilot Combination Natural Gas VS820A1054 A four port non-bleed pneumatic relay which produces a modulating pressure output, proportional in a fixed ratio to pilot input changes. It is used to control pneumatic valve or damper actuators in sequence from a single thermostat. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices Features: Adjustable pilot start point pressures. Two pilot pressure spans available. Four sharp-barb air connections. Molded plastic construction with neoprene. Mounting clip provided Specifications: Description: Wall, In-Line or panel mounted Pneumatic Four Port Ratio Relay Type: Pneumatic, Four Port Ratio Relay Action: Direct Acting Operation: Produces modulating pressure output proportional to pilot pressure input changes Airflow Usage: 0.002scfm(1.0 mL/s) maximum Air Connections: Barb fittings, Port 1: 1/4 in. (6 mm) O.D. plastic tubing; Other Ports: 5/32 in. (4 mm) O.D. plastic tubing Capacity: 0.039scfmat 1 psi differential (18 mL/s at 5 kPa differential) Mounting: Wall or In-line or panel Maximum Safe Operating Pressure (psi): 30 psi Operating Humidity Range (% RH): 5 to 95% RH Temperature Range: 0 F to 140 F Output Span: 3 to 13 psi Pilot input span: 5 psi input span for 3 to 13 psi output Pilot Start Pressure: Adjustable 0 to 10 psi