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Welcome to the Wholesale Plumbing Supply Co., Inc. (St. Louis Missouri) Web Sites. We invite you to take some time to familiarize yourself with our company. Wholesale Plumbing Supply Co., Inc. is a second generation locally owned and operated company, who will continually strive to increase service levels to our contractor customers. We will pursue the best product offering which best compliments our customer needs and desires. Wholesale Plumbing Supply Co., Inc. is the leading source for plumbing supplies in the St. Louis area because we offer a great selection, great service and a fair price. Our mission is the same as it was in 1957. HOURS OF OPERATION: Mon-Fri 7AM to 4PM