MACK INDUSTRIES, INC.

031-03100 AIR CONDITIONING, HEATING, AND VENTILATING EQUIPMENT, PARTS AND ACCESSORIES | 031-03106 AIR CONDITIONING AND HEATING CENTRAL AIR SYSTEMS, INCLUDING PARTS AND ACCESSORIES, (NOT OTHERWISE CLASSIFIED) | 031-03111 BLOWERS, INDUSTRIAL TYPES | 031-03125 CONTROLS, LIMIT SWITCHES, RELAYS, THERMOSTATS, GAS VALVES, ETC. | 031-03151 FURNACES, CENTRAL HEATING TYPE, FORCED AIR, GAS FIRED | 135-13512 CEMENT, MORTAR, REFRACTORY | 135-13560 TILE, FIRE, REFRACTORY | 430-43020 Filters, Natural And Lpg Gas | 430-43036 Gas Regulators, Gauges, Fittings, And Parts | 557-55705 Air Conditioning, Heating And Ventilation | 670-67067 Vacuum Breakers | 670-67068 Valves, Aluminum | 670-67069 VALVES, BRASS, CHROME, COPPER | 670-67070 Valves, Bronze: Angle, Ball, Check, Gate, Globe, Etc. | 670-67071 Valves, Butterfly, All Kinds | 670-67072 VALVES, CHROME (INACTIVE, PLEASE SEE COMMODITY CODE 670-69 EFFECTIVE JANUARY 1, 2016) | 670-67073 Valves, Flush, All Types; And Parts | 670-67074 Valves, Drop-Out | 670-67075 Valves, Iron Body: Angle, Check, Gate, Globe, Etc. | 670-67077 Valves, Plastic: Ball, Check, Diaphragm, Globe, Etc. | 670-67079 VALVES, SEMI-STEEL (INACTIVE, PLEASE SEE COMMODITY CODE 670-82 EFFECTIVE JANUARY 1, 2016) | 670-67080 Valves, Solenoid Control | 670-67081 Valves, Stainless Steel: Angle, Ball, Check, Gate, Globe, Etc. | 670-67082 Valves, Steel: Angle, Check, Gate, Globe, Etc. | 670-67089 Water Heater, Residential | 670-67091 Water Heaters, Commercial | 720-72012 Booster Or Circulating Pumps, In-Line | 720-72015 Centrifugal Pumps, Portable | 720-72018 Centrifugal Pumps, Stationary | 720-72055 Proportioning Pumps: Chemical Feed, Metering, Positive Displacement, And Injector Pumps (See Also Class 820) | 820-82000 Steam And Hot Water Boilers And Steam Heating Equipment | 820-82008 Boilers, High Pressure | 820-82012 Boilers, Low Pressure | 820-82014 BOILER PARTS AND ACCESSORIES (NOT OTHERWISE CLASSIFIED) | 820-82028 Burners, Gas And Oil | 820-82036 Coils, Steam Heating | 820-82038 Condensate Return Systems: Vacuum Heat Pumps, Wet Vacuum Pumps, Etc. | 820-82052 Draft Fans And Draft Gauges | 820-82096 Recycled Steam And Hot Water Boilers And Heating Equipment | 910-91036 HEATING, AIR CONDITIONING, AND VENTILATION MAINTENANCE, REPAIR AND INSTALLATION SERVICES | 914-91450 Heating, Ventilating And Air Conditioning (Hvac) | 928-92830 COOLING, HEATING, AND VENTILATING SYSTEM, A/C SYSTEM, HOSES, WATER PUMP, RADIATOR, HEATER AND ACCESSORIES, VENTILATION, ETC. MAINTENANCE AND REPAIR | 934-93464 PLUMBING EQUIPMENT AND FIXTURES MAINTENANCE AND REPAIR | 941-94125 BOILER MAINTENANCE AND REPAIR, STEAM, INCLUDING TESTING SERVICES, (SEE 941-56 FOR HYDROSTATIC TESTING) | 941-94152 HEATING, STEAM, EQUIPMENT MAINTENANCE AND REPAIR | 941-94188 TURBINES, STEAM, MAINTENANCE AND REPAIR | C-00090 BOILERS (NEW/REPAIR) | C-00690 HVAC | C-00870 MECHANICAL CONSTRUCTION | C-00940 OIL AND GAS BURNERS | C-00970 PAINTING - BRIDGES, TANKS, - STEEL & ELEVATED STRU | C-01940 WELDING