FOR RESIDENTIAL AND COMMERCIAL LOW PRESSURE STEAM BOILER APPLICATIONS. FOR BOILERS OF ANY STEAMING CAPACITY. FOR MOUNTING IN 2-1/2"" NPT BOILER SIDE TAPINGS. INSERTION LENGTHS AVAILABLE IN 13/16 - 41/8"" (30-105MM). PACK LESS BELLOWS. ADJUSTABLE BX OUTLET FOR EASY INSTALLATION. DUAL PRECISION SWITCHES FOR DEPENDABLE OPERATION OF THE LOW WATER CUT-OFF AND AN ALARM OR ELECTRIC WATER FEEDER. OPTIONAL LOW VOLTAGE SWITCHES FOR SELF-GENERATING MILL VOLT CIRCUITS. MAXIMUM STEAM PRESSURE 20 PSI (1. 4 KG/CM2). MADE IN THE USA .