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Keystone Sales & Associates (KSA) was established in 1973, formerly EIA is the premier manufacturers' representative for Plumbing, Heating, Ventilation and Air Conditioning products in the Mid-Atlantic region. Headquartered in Pottstown, Pennsylvania, the company is experiencing rapid growth and expansion by offering a large selection of related products from a single source. As a value-added supplier, KSA provides Distributors and Contractors with customer support and hands-on technical training through its professional development arm, Keystone University.