The 028-08312-003 typically contains three specialized o-rings required for standard maintenance on targeted filter housings and shell covers

The 577-0415-04 is the manufacturer-designated direct replacement

000 BTU on natural gas systems

Where is it installed

and prevent common pressure switch faults caused by a deteriorating blower wheel or high-amp motor draw

Armstrong International 15BI3 Trap 321702-401 The 028-08312-003 typically contains threeThe Armstrong International 15BI3 is a high performance Series B Float and Thermostatic Steam Trap engineered for low pressure steam heating services. This 3 4" NPT in line connection trap features a robust cast iron body and a 7 32" orifice, specifically designed to handle a maximum operating pressure of 15 PSI. By utilizing a high leverage valve mechanism and a dedicated thermostatic air vent, the 15BI3 ensures immediate discharge of air and non