Supply Service & Distribution NAICS CODES- WHOLESALE TRADE: 421830 INDUSTRIAL MACHINERY AND EQUIPMENT WHOLESALERS 428140 INDUSTRIAL SUPPLIES WHOLESALERS 421850 SERVICE ESTABLISHMENT EQUIPMENT AND SUPPLIES WHOLESALERS 422690 OTHER CHEMICAL AND ALLIED PRODUCTS Professional Diversified Services, Inc. is a distributor of Industrial, Janitorial, Material Handling Equipment and Supplies. We are representing over 4,500 manufacturer’s and dealers of tools, packing supplies, electrical, safety products and many more. PDSI also has warehousing space to stock your items for quicker replenishing times to help keep your operation running smoothly.