Penco, headquartered in Seaford, Del., is a wholesale distributor of plumbing, heating, air conditioning, and refrigeration products and services. It distributes products, including air conditioners, heat pumps, furnances, boilers, hydronics, duct, pipes, valves, fittings, hangars, bathtubs, showers, whirlpools, water heaters, tools, pumps, tanks, and well supplies. It distributes these...